COM, in composition as a prefix denotes with, to or against.
COM, prep. [COM-.]
In composition as a prefix, Ir. comh, or coimh, W. cym or cyv, L. com or cum, denotes with, to, or against.
- 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