simulate v.

mid-14c., simulacioun, "a false show, false profession," from Old French simulation "pretence" and directly from Latin simulationem (nominative simulatio) "an imitating, feigning, false show, hypocrisy," noun of action from past-participle stem of simulare "imitate," from stem of similis "like, resembling, of the same kind" (see similar). The meaning "a model or mock-up for purposes of experiment or training" is from 1954.

"having characteristics in common," 1610s (earlier similary, 1560s), from French similaire, from a Medieval Latin extended form of Latin similis "like, resembling, of the same kind," from Old Latin semol "together" (from PIE root *sem- (1) "one; as one, together with"). The noun meaning "that which is similar" is from 1650s. Related: Similarly.