ORIGINATIVE

creative, originative

(adjective) having the ability or power to create; “a creative imagination”

germinal, originative, seminal

(adjective) containing seeds of later development; “seminal ideas of one discipline can influence the growth of another”

Source: WordNet® 3.1

Adjective

originative (comparative more originative, superlative most originative)

That originates; creative

Source: Wiktionary

O*rig"i*na*tive, a.

Definition: Having power, or tending, to originate, or bring into existence; originating. H. Bushnell.

– O*rig"i*na*tive*ly, adv.

Source: Webster’s Unabridged Dictionary 1913 Edition