| determinant factor(expression, reason, significance, factor) |
| dominant factor(expression, reason, significance, factor) |
| key enabler(expression, reason, significance, factor) |
| leading cause(expression, reason, significance, fact) |
| main reason(expression, reason, significance, fact) |
| master factor(expression, reason, significance, factor) |
| overriding reason(expression, reason, significance, fact) |
| shaping factor(expression, reason, significance, factor) |
| key aspect(expression, cause, moment, influence, importance) |
| initial cause(expression, cause, value, fact) |
| original cause(expression, cause, value, fact) |
| original reason(expression, cause, value, fact) |
| primal cause(expression, cause, value, fact) |
| root motive(expression, cause, value, fact) |
| root source(expression, cause, value, fact) |
| basic condition(expression, reason, importance, fact) |
| key condition(expression, reason, importance, fact) |
| main condition(expression, reason, importance, fact) |
| major term(expression, reason, importance, fact) |
| pacing factor(expression, reason, importance, fact) |