1580s, probably from imitate + -ive; or else from Middle French imitatif, from Late Latin imitativus, from imitat-, stem of Latin imitari "to copy, portray" (from PIE root *aim- "to copy").
acting is an imitative art
man is an imitative being
onomatopoeic words are imitative of noises
imbue
imburse
imitable
imitate
imitation
imitative
imitator
immaculacy
immaculate
immanence
immanent