CS Knowledge Base

Short for radiotelegraphy.

• (Received Pronunciation) IPA^(key): /ˈɹeɪdiˌəʊ/
• (General American) IPA^(key): /ˈɹeɪdiˌoʊ/

• Audio (US):

  (file)

• Hyphenation: ra‧dio

radio (countable and uncountable, plural radios)

2. (uncountable) The technology that allows for the transmission of sound or other signals by modulation of electromagnetic waves.

   send a message by radio

4. (countable) A device that can capture (receive) the signal sent over radio waves and render the modulated signal as sound.

   We heard a lovely song on the radio.

   She was listening to the radio when he knocked on the door.

5. (countable) Any audio playing device, such as the on-board entertainment system in a car, usually including a radio receiver as well as the capability to play audio from recorded media; see also car radio.
   • 2018 February 6, Jonathan Amos, “Elon Musk's huge Falcon Heavy rocket set for launch”, in BBC News‎^[1], London, United Kingdom: BBC, retrieved 7 February 2018:

     David Bowie's classic hit Space Oddity will be looping on the radio as the car is hurled into an elliptical orbit that stretches out to Mars' orbit around the Sun.

6. (countable) A device that can transmit radio signals.
7. (Internet, uncountable) The continuous broadcasting of sound via the Internet in the style of traditional radio.

• (device to capture radio signal): tuner, wireless, receiver

• transceiver

radio (third-person singular simple present radios or radioes, present participle radioing, simple past and past participle radioed)

1. (ambitransitive) To use two-way radio to transmit (a message) (to another radio or other radio operator).

   I think the boat is sinking; we'd better radio for help. / I radioed him already. / Radio the coordinates this time. / OK. I radioed them the coordinates.

2. (transitive) To order or assist (to a location), using telecommunications.
   • 2002, Jack Dave, Death Bridge, iUniverse, →ISBN, page 40:

     “Could you call them here? I'd like to talk to them. Or if they're out in the field, radio them in.”

   • 2006, Angie Morgan with Courtney Lynch, Leading from the front: no excuse leadership tactics for women, page 111:

     When I told him that they weren't back yet, he asked if we could radio them back early […] Radioing them in was fine with me.

   • 2006, Kimberly Johnson, Amy's Secret, page 14:

     When she arrived, she was told that Tad wasn't there and to have a seat and wait while they radioed him in.

• radio ahead

• aroid, doira

Borrowed from English radio.

• IPA^(key): /ˈrɑː.di.ʊə̯/

• Audio:

  (file)

radio (plural radio's)

1. radio

radio f (plural radios)

1. radio

From English radio.

• Audio:

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radio (definite accusative radionu, plural radiolar)

1. radio

• “radio” in Obastan.com.

• IPA^(key): /radio/ [ra.ð̞i.o]
• Rhymes: -io, -o
• Hyphenation: ra‧di‧o

Borrowed from Spanish radio (“radium”), from French radium.

radio inan

1. radium

Borrowed from Spanish radio (“radio”).

radio inan

1. nonstandard form of erradio (“radius”)

• “radio”, in Euskaltzaindiaren Hiztegia [Dictionary of the Basque Academy] (in Basque), Euskaltzaindia [Royal Academy of the Basque Language]
• “radio”, in Orotariko Euskal Hiztegia [General Basque Dictionary], Euskaltzaindia, 1987–2005

Compare English radio.

radio

1. radio

• Mirjejev, V. A.; Usejinov, S. M. (2002), Ukrajinsʹko-krymsʹkotatarsʹkyj slovnyk [Ukrainian – Crimean Tatar Dictionary]‎^[2], Simferopol: Dolya, →ISBN

radio c (singular definite radioen, plural indefinite radioer)

1. (technology) radio

• radiobølge

• “radio” in Den Danske Ordbog
• “radio” in Ordbog over det danske Sprog

Borrowed from English radio, from Latin radius. Doublet of radius.

• IPA^(key): /ˈraː.di.(j)oː/

• Audio:

  (file)

• Hyphenation: ra‧dio

radio m (plural radio's, diminutive radiootje n)

1. radio, tuner

• → Aukan: ladio
• → Caribbean Hindustani: rádio
• → Caribbean Javanese: radio, radhio
• → Indonesian: radio
• → Saramaccan: ládio
• → Trió: raarijon

From Latin radius. Compare Italian raggio, French rai, Spanish rayo.^[1]

• IPA^(key): /raˈdio/

• Audio:

  (file)

• Rhymes: -io
• Syllabification: ra‧di‧o

radio (accusative singular radion, plural radioj, accusative plural radiojn)

1. radio
2. radius
3. ray

• radiofonio

• radiado
• vekradio (“clock radio”)

• “radio”, in Plena Ilustrita Vortaro de Esperanto [Complete Illustrated Dictionary of Esperanto], 2020, →ISBN
• “radio”, in Reta Vortaro [Online Dictionary] (in Esperanto), 1997-2026

< Swedish radio (“radio”) or English radio

• IPA^(key): /ˈrɑdio/, [ˈrɑ̝dio̞]
• Rhymes: -ɑdio
• Syllabification^(key): ra‧di‧o
• Hyphenation^(key): ra‧dio

radio

1. radio (technology)
2. radio (receiver or transmitter)
3. radio (type of media)
4. (in compounds) radio- (of or pertaining to radiowaves)

• sätiö (rare, archaic)
• (technology): radiotekniikka
• (receiver): radiovastaanotin, vastaanotin
• (transmitter): radiolähetin

• “radio”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish]‎^[3] (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 3 July 2023

An abbreviation of words like radiotélégramme, radiotélégraphiste, radiodiffusion, etc. Compare English radio.

• IPA^(key): /ʁa.djo/

• Audio:

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• Audio (Switzerland (Valais)):

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• Audio (France (Paris)):

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• Audio (France (Vosges)):

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• Audio (France (Vosges)):

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radio f (plural radios)

1. radio, tuner
2. short for radiographie

radio m (plural radios)

1. short for radiotélégramme

radio m or f by sense (plural radios)

1. short for radiotélégraphiste

• → Persian: رادیو (râdiyo)

• “radio” in the Dictionnaire de l’Académie française, 8th Edition (1932–35).
• “radio”, in Dictionnaire français en ligne Larousse
• “radio” in Dictionnaire Le Robert.
• “radio”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012

• dorai, rodai, rôdai

An abbreviation based on words beginning with the root radio-. Compare English radio.

radio m (plural radios)

1. radio

Borrowed from French radium, from radio(actif) + -ium.

radio m (plural radios)

1. (uncountable) radium

Learned borrowing from Latin radius.

radio m (plural radios)

1. radius (of a circular object)
2. (anatomy) radius (bone in the forearm)

Borrowed from Danish radio.

radio (plural radiot)

1. radio

• radio in Katersat
• “radio“ in iserasuaat.gl

From radiar +‎ -o.

• IPA^(key): /ˈradio/

radio (plural radii)

1. ray, beam, gleam
2. radio (device)
3. (geometry) radius
4. spoke (of a wheel)
5. (ichthyology) ray, skate

• (5) rayo

• radyo — informal

Borrowed from Spanish radio.

• IPA^(key): /ˈɾadjo/ [ˈɾɐ.d͡ʒo]
• Hyphenation: rad‧io

radio

1. radio

Borrowed from Dutch radio, from English radio, from Latin radius.

• (Standard Indonesian) IPA^(key): /raˈdio/ [raˈdi.o]

• Audio:

  (file)

• Rhymes: -o
• Syllabification: ra‧di‧o

radio (plural radio-radio)

1. radio

   Synonyms: peti bicara, peti ngomong

• “radio”, in Kamus Besar Bahasa Indonesia [Great Dictionary of the Indonesian Language] (in Indonesian), Jakarta: Agency for Language Development and Cultivation – Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia, 2016

radio

1. radio

Chemical element
Ra
Previous: francio (Fr)
Next: attinio (Ac)

Borrowed from Latin radius. Doublet of raggio, razzo, and rai, the first two of which were inherited from Latin, while the last was borrowed from Occitan.

• IPA^(key): /ˈra.djo/
• Rhymes: -adjo
• Hyphenation: rà‧dio

radio m (plural radi)

1. (anatomy) radius

   Synonyms: radiale, osso radiale

2. (obsolete) alternative form of raggio

• radiale
• radiante

Borrowed from French radium, from radio(actif) + -ium.

radio m (plural radi)

1. (chemistry) radium

Abbreviation. Compare English radio.

radio f (invariable)

1. radio

radio

1. first-person singular present indicative of radiare

• Adrio, Dario, Doria, adiro, adirò, adori, arido, dorai, rioda, rodai

From radius (“spoke of a wheel”) +‎ -ō.

• (Classical Latin) IPA^(key): [ˈra.di.oː]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈraː.di.o]

radiō (present infinitive radiāre, perfect active radiāvī, supine radiātum); first conjugation

1. (active voice) to cause to radiate, irradiate
2. (passive voice) to radiate, emit beams

radiō

1. dative/ablative singular of radium

• “radio”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
• “radio”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers

Borrowed from Latvian radio.

• IPA^(key): /ˈrɑdio/, [ˈrɑdio]

radio

1. radio

• Tiit-Rein Viitso; Valts Ernštreits (2012–2013), “radio”, in Līvõkīel-ēstikīel-lețkīel sõnārōntõz [Livonian-Estonian-Latvian Dictionary]‎^[4] (in Estonian and Latvian), Tartu, Rīga: Tartu Ülikool, Latviešu valodas aģentūra

Borrowed from English radio, clipping of radiotelegraphy.

• (schwa-variety, Baku, Riau-Lingga) IPA^(key): /ˈradjo/ [ˈra.djo]
• Rhymes: -o
• Hyphenation: ra‧di‧o

radio (Jawi spelling راديو, plural radio-radio or radio²)

1. radio

• "radio" in Pusat Rujukan Persuratan Melayu (PRPM) [Malay Literary Reference Centre (PRPM)] (in Malay), Kuala Lumpur: Dewan Bahasa dan Pustaka, 2017

Borrowed from English radio.

radio m (plural radios)

1. radio

radio m (definite singular radioen, indefinite plural radioer, definite plural radioene)

1. (a) radio

• “radio” in The Bokmål Dictionary.

radio m (definite singular radioen, indefinite plural radioar, definite plural radioane)

1. radio
   • 1926, Olav Langeland, Rikare liv:

     Det vedunderet som me no kallar radio, hev synt det endå klårare. Det er ljosbylgjor som er so små og snøgge, og sume so langsame at ikkje noko menneskjeauga kann uppfanga dei.

     The miracle that we now call radio has shown this even clearer. It is light waves that are so small and fast, and some so slow that no human eye can perceive them.

• “radio” in The Nynorsk Dictionary.

Borrowed from French radio.

• IPA^(key): /ˈra.djɔ/

• Audio:

  (file)

• Rhymes: -adjɔ
• Syllabification: ra‧dio
• Homophone: radio-

radio n (diminutive radyjko, related adjective radiowy)

1. radio (a device that can receive the signal sent over radio waves)

   Synonyms: radioodbiornik, odbiornik radiowy

2. radio station

   Synonyms: rozgłośnia, radiostacja, stacja radiowa

• radio in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
• radio in Polish dictionaries at PWN

Borrowed from French radio, German Radio; compare also English radio.

• Audio:

  (file)

radio n (plural radiouri)

1. radio

• IPA^(key): /râːdio/
• Hyphenation: ra‧di‧o

rȃdio m inan (Cyrillic spelling ра̑дио)

1. radio

See the etymology of the corresponding lemma form.

radio (Cyrillic spelling радио)

1. active past participle of raditi

Chemical element
Ra
Previous: francio (Fr)
Next: actinio (Ac)

• IPA^(key): /ˈradjo/ [ˈra.ð̞jo]
• Rhymes: -adjo
• Syllabification: ra‧dio

Clipping of radiorreceptor.

radio m or f same meaning (plural radios)

1. (electronics, home appliance) radio (device)

• Usually feminine, but often used as masculine in much of Latin America.

• Chavacano: radio
• → Cebuano: radyo
• → Hiligaynon: radyo
• → Ilocano: radio
• → Maguindanao: radiu
• → Maranao: radiyo
• → Tagalog: radyo
• → Ye'kwana: daadiyu

Clipping of radiotransmisión or radiodifusora.

radio f (plural radios)

1. (communication) radio (industry, signal)

Borrowed from Latin radius. Doublet of rayo.

radio m (plural radios)

1. (anatomy) radius
2. (geometry) radius

Borrowed from French radium, from radio(actif) + -ium.

• radium, rádium (Spain)

radio m (plural radios)

1. (chemistry) radium

radio

1. first-person singular present indicative of radiar

• Appendix:Spanish nouns that have different meanings depending on their gender

• “radio”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025

radio class IX (plural radio class X)

1. alternative form of redio

From English radio.

• Audio:

  (file)

radio c

1. (uncountable) radio (communication using radio waves)
2. radio; receiver (device for receiving broadcast radio signals)

• radio-

• “radio”, in Svensk ordbok [Dictionary of Swedish] (in Swedish)
• “radio”, in Svenska Akademiens ordlista [Wordlist of the Swedish Academy] (in Swedish)
• “radio”, in Svenska Akademiens ordbok [Dictionary of the Swedish Academy] (in Swedish)

• Hyphenation: ra‧dio

radio (definite accusative radiony, plural radiolar)

1. radio

• “radio” in Enedilim.com
• “radio” in Webonary.org

radio (plural radiolar)

1. radio

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

radio

1. radio

Inflection of radio (inflection type 1/ilo)
nominative sing.	radio
genitive sing.	radion
partitive sing.	radiod
partitive plur.	radioid
	singular	plural
nominative	radio	radiod
accusative	radion	radiod
genitive	radion	radioiden
partitive	radiod	radioid
essive-instructive	radion	radioin
translative	radioks	radioikš
inessive	radios	radioiš
elative	radiospäi	radioišpäi
illative	radioho	radioihe
adessive	radiol	radioil
ablative	radiolpäi	radioilpäi
allative	radiole	radioile
abessive	radiota	radioita
comitative	radionke	radioidenke
prolative	radiodme	radioidme
approximative I	radionno	radioidenno
approximative II	radionnoks	radioidennoks
egressive	radionnopäi	radioidennopäi
terminative I	radiohosai	radioihesai
terminative II	radiolesai	radioilesai
terminative III	radiossai	—
additive I	radiohopäi	radioihepäi
additive II	radiolepäi	radioilepäi

• Zajceva, N. G.; Mullonen, M. I. (2007), “радио”, in Uz’ venä-vepsläine vajehnik / Novyj russko-vepsskij slovarʹ [New Russian–Veps Dictionary]‎^[5], Petrozavodsk: Periodika

From English radio.

• IPA^(key): /ˈradjɔ/
• Rhymes: -adjɔ

radio m (plural radios, not mutable)

1. radio

• radio bro (“community radio”)

• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “radio”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies