| crucial component(expression, reason, importance, significance) |
| crucial factor(expression, reason, importance, significance) |
| crucial moment(expression, reason, importance, significance) |
| crucial point(expression, reason, importance, significance) |
| crucial thing(expression, reason, importance, significance) |
| crunch point(expression, reason, importance, significance) |
| deciding factor(expression, reason, importance, significance) |
| decisive factor(expression, reason, importance, significance) |
| decisive point(expression, reason, importance, significance) |
| determinant factor(expression, reason, importance, significance) |
| determinative factor(expression, reason, importance, significance) |
| dominant cause(expression, reason, importance, significance) |
| dominant factor(expression, reason, importance, significance) |
| driving factor(expression, reason, importance, significance) |
| first principle(expression, reason, importance, significance) |
| fundamental cause(expression, reason, importance, significance) |
| fundamental premise(expression, reason, importance, significance) |
| fundamental reason(expression, reason, importance, significance) |
| fundamental term(expression, reason, importance, significance) |
| governing factor(expression, reason, importance, significance) |