c.1430, from L. consummatus "perfected, complete," pp. of consummare (see consummation). Of persons, "accomplished, very qualified," from 1640s. Related: Consummately (1610s).
1520s, "to bring to completion," from L. consummat-, pp. stem of consummare "to sum up, make up, complete, finish" (see consummation). Meaning "to bring a marriage to completion" (by sexual intercourse) is from 1530s.