1. A Latin prefix. See Con.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• comm,
• como,
• coom,
• comi,
• come,
• comb,
• coma,
• comu,
• cumo,
• c0m-,
• com0,
• xcom-,
• cxom-,
• vcom-,
• cvom-,
• fcom-,
• cfom-,
• ckom-,
• cpom-,
• c0om-

The adjective form of the word "com-" is "complimentary".