1640s, "springing back, returning to the original position," from Latin resilientem "inclined to leap or spring back," present participle of resilire "to jump back" (see resilience). Of material things, "resuming original shape after compression, etc.," by 1670s. Figuratively, of persons "bouncing back" from difficulties, etc., from 1830. Related: Resiliently.
c. 1500, "to find, discover" (obsolete), a back-formation from invention or else from Latin inventus, past participle of invenire "to come upon; devise, discover."
The general sense of "make up, fabricate, concoct, devise" (a plot, excuse, etc.) is from 1530s, as is that of "produce by original thought, find out by original study or contrivance." Related: Invented; inventing.
"repeat a response after the cessation of the original stimulus," by 1909, in psychology, a back-formation from perseveration. Related: Perseverating; perseverative.