com
Webster's Dictionary (GCIDE)
Com- \Com-\ A prefix from the Latin preposition cum, signifying with, together, in conjunction, very, etc. It is used in the form com- before b, m, p, and sometimes f, and by assimilation becomes col- before l, cor- before r, and con- before any consonant except b, h, l, m, p, r, and w. Before a vowel com- becomes co-; also before h, w, and sometimes before other consonants. [1913 Webster]
Free On-line Dictionary of Computing
COM
1.<programming> Component Object Model.
2.<storage> Computer Output on Microfilm - see Enterprise Report Management.
com