| impetus(source, upwelling) |
| impulse(cause, influence, source, derivation, ancestry) |
| inauguration(cause, start, beginning, source, origin) |
| inducement(cause, source, derivation) |
| infancy(noun, beginning, origin, birth, dawn) |
| influence(cause, source, derivation, ancestry) |
| informant(cause, foundation, basis) |
| ingress(cause, source, origin, derivation, birth) |
| initiation(cause, start, beginning, source, origin) |
| introduction(cause, source, origin, derivation, birth) |
| launch(cause, start, beginning, source, origin) |
| leap |
| maternity(cause, foundation, basis) |
| milch cow(expression, idiom, store) |
| motive(cause, source, derivation, upwelling) |
| nativity(noun, cause, beginning, source, foundation) |
| nucleus(cause, influence, source, derivation, ancestry) |
| nursery(noun, beginning, origin, birth, dawn) |
| occasion(cause, source, derivation) |
| onset(cause, foundation, basis) |