from The American Heritage® Dictionary of the English Language, 4th Edition
- Together; with; joint; jointly: commingle.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- the form of con- used before b, m, and p
from the GNU version of the Collaborative International Dictionary of English
- 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.
Middle English, from Latin; see kom in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin com ("with"), an archaic form of cum ("with") (Wiktionary)