Com-

[Sarah]

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.