Merriam-Webster Collegiate Dictionary - compeer

 I. noun  Etymology: Middle English, from Anglo-French cumpere, literally, godfather, from Medieval Latin compater, from Latin com- + pater father — more at father  Date: 13th century companion  II. noun  Etymology: Middle English comper, from Anglo-French, from Latin compar, from compar, adjective, like — more at compare  Date: 15th century equal, peer  • ~ transitive verb, obsolete