English

Etymology

Etymology tree
Proto-Indo-European *h₂el-der.?
Proto-Indo-European *h₂elnós
Proto-Germanic *allaz
Proto-Germanic *ala-
Proto-West Germanic *ala-
Old English æl-
Middle English all-
English all-
English important
English all-important

    From all- + important.

    Adjective

    all-important

    1. Very important; vital or crucial.
    source: https://en.wiktionary.org/wiki/all-important