| a. | 1. | Having the form of a cross; appertaining to a cross; cruciform; intersecting; |
| 2. | Severe; trying or searching, as if bringing to the cross; decisive; |
| Adj. | 1. | crucial - of extreme importance; vital to the resolution of a crisis; "a crucial moment in his career"; "a crucial election"; "a crucial issue for women" Synonyms: important Antonyms: noncrucial - of little importance; not decisive |
| 2. | crucial - having crucial relevance; "crucial to the case"; "relevant testimony" Synonyms: relevant | |
| 3. | crucial - of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence" | |
| 4. | crucial - having the power or quality of deciding; "the crucial experiment"; "cast the deciding vote"; "the determinative (or determinant) battle" |