late 14c., "to put (something) into the body or substance of (something else), blend; absorb, eat," also "solidify, harden," often in medical writing, from Late Latin incorporatus, past participle of incorporare "unite into one body, embody, include," from Latin in- "into, in, on, upon" (from PIE root *en "in") + verb from corpus (genitive corporis) "body" (from PIE root *kwrep- "body, form, appearance").
Meaning "to legally form a body politic with perpetual succession and power to act as one person, establish as a legal corporation" is from mid-15c. (A verb corporate was used in this sense from early 15c.) Intransitive sense of "unite with another body so as to become part of it" is from 1590s. Related: Incorporated; incorporating.
"a dead body, a corpse," late 14c., from Latin cadaver "dead body (of men or animals)," probably from a perfective participle of cadere "to fall, sink, settle down, decline, perish," from PIE root *kad- "to fall." Compare Greek ptoma "dead body," literally "a fall" (see ptomaine); poetic English the fallen "those who have died in battle."
"dead body of an animal," late 13c., from Anglo-French carcois, from or influenced by Old French charcois (Modern French carcasse) "trunk of a body, chest, carcass," and Anglo-Latin carcosium "dead body," all of unknown origin; original form uncertain. It may have been assimilated to Latin caro "flesh." Not used of humans after c. 1750, except contemptuously. Italian carcassa probably is a French loan-word.
1690s in the scientific use in mechanics, "product of the mass and velocity of a body; quantity of motion of a moving body," from Latin momentum "movement, moving power" (see moment). Figurative use, "force gained by movement, an impulse, impelling force," dates from 1782.