CRUCIAL
crucial, important
(adjective) of extreme importance; vital to the resolution of a crisis; “a crucial moment in his career”; “a crucial election”; “a crucial issue for women”
crucial, all important, all-important(a), essential, of the essence
(adjective) of the greatest importance; “the all-important subject of disarmament”; “crucial information”; “in chess cool nerves are of the essence”
crucial
(adjective) having crucial relevance; “crucial to the case”; “relevant testimony”
Source: WordNet® 3.1
Etymology
Adjective
crucial (comparative more crucial, superlative most crucial)
Essential or decisive for determining the outcome or future of something; extremely important.
Synonym: Thesaurus:important
(archaic) Cruciform or cruciate; cross-shaped.
(slang, chiefly, Jamaica) Very good; excellent; particularly applied to reggae music.
Source: Wiktionary
Cru"cial (kr"shal), a. Etym: [F. crucial, fr. L. crux, crucis, cross,
torture. See Cross.]
1. Having the form of a cross; appertaining to a cross; cruciform;
intersecting; as, crucial ligaments; a crucial incision.
2. Severe; trying or searching, as if bringing to the cross;
decisive; as, a crucial test.
Source: Webster’s Unabridged Dictionary 1913 Edition