com-

com-

a prefix meaning “with,” “together,” “in association,” and (with intensive force) “completely,” occurring in loanwords from Latin (commit ): used in the formation of compound words before b, p, m: combine; compare; commingle.
Also, co-, col-, con-, cor-.


Origin:
< Latin, variant of preposition cum with

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Collins
World English Dictionary
com- or con-
 
prefix
together; with; jointly: commingle
 
[from Latin com-; related to cum with. In compound words of Latin origin, com- becomes col- and cor- before l and r, co- before gn, h, and most vowels, and con- before consonants other than b, p, and m. Although its sense in compounds of Latin derivation is often obscured, it means: together, with, etc (combine, compile); similar (conform); extremely, completely (consecrate)]
 
con- or con-
 
prefix
 
[from Latin com-; related to cum with. In compound words of Latin origin, com- becomes col- and cor- before l and r, co- before gn, h, and most vowels, and con- before consonants other than b, p, and m. Although its sense in compounds of Latin derivation is often obscured, it means: together, with, etc (combine, compile); similar (conform); extremely, completely (consecrate)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

com-
from L., archaic form of classical L. cum "together, together with, in combination," the prefix sometimes used as an intensive, from PIE *kom- "beside, near, by, with" (cf. O.E. ge-, Ger. ge-). Before vowels and aspirates, reduced to co-; before -g-, assimilated to cog- or con-; before -l-, assimilated
to col-; before -r-, assimilated to cor-; before -c-, -d-, -j-, -n-, -q-, -s-, -t-, -v- assimilated to con-.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

com- or col- or con-
pref.
Together; with; joint; jointly: commensalism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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