c. 1300, "have dealings with," from Old French comuner "to make common, share" (10c., Modern French communier), from comun "common, general, free, open, public" (see common (adj.)). Meaning "to talk intimately" is late 14c. Related: Communed; communing.

"one who or that which communicates," 1660s, from Late Latin communicator, agent noun from communicare "to share, divide out; communicate, impart, inform; join, unite, participate in," literally "to make common," related to communis "common, public, general" (see common (adj.)). Related: Communicatory.

1540s, "not possessed in common," from un- (1) "not" + common (adj.). Meaning "not commonly occurring, unusual, rare" is recorded from 1610s. Related: Uncommonly.

common abbreviation of abbreviation.

obsolete spelling of common.

"member of the lowest class or the common people," 1530s, from Latin plebius "person not of noble rank," from adjective meaning "of the common people" (see plebeian (adj.)).

also coenogamy, "state of having husbands or wives in common," 1883,  from Latinized form of Greek koinos "common" (see coeno-) + -gamy. Related: Cenogamous; coenogamous.

late 14c., "that communicates," from French communicatif, from Latin communicat-, past participle stem of communicare "to share, divide out; communicate, impart, inform; join, unite, participate in," literally "to make common," related to communis "common, public, general" (see common (adj.)). Meaning "talkative, not reserved, ready to converse" is recorded from 1650s. Related: Communicativeness.

common commercial abbreviation of Brothers.

before vowels coen-, word-forming element meaning "common," from Latinized form of Greek koinos "common, public, shared, general, ordinary," from PIE *kom "beside, near, by, with" (see com-).