late 14c., "act of carrying, means of conveyance; wheeled vehicles collectively," from Anglo-French and Old North French cariage "cart, carriage, action of transporting in a vehicle" (Old French charriage, Modern French charriage), from carier "to carry," from Late Latin carricare, from Latin carrus "two-wheeled wagon" (see car).
Meaning "individual wheeled vehicle" is c. 1400; specific sense of "horse-drawn, wheeled vehicle for hauling people" first attested 1706; extended to railway cars by 1830. Meaning "the business of transportation" is from 1520s. Meaning "way of carrying one's body" is 1590s, hence also "behavior, conduct, manners." Sense of "a part of a machinery which carries another part" is from 1680s. Carriage-house attested from 1761.