- (non-productive) used with certain words to add a notion similar to those conveyed by with, together, or joint
- congenial, congregation, console, consonant, construct, converge, etc.
- (non-productive) used with certain words to intensify their meaning
- col- before l: collaborate;
- com- before b, m, and p: combat, commit, compel;
- cor- before r: correlation;
- attached to certain words to obtain new, informal, subcultural words in which con- conveys a notion of:
From preposition cum (“with”)
- Used in compounds to indicate a being or bringing together of several objects
- coëo, colloquor, convivor, etc.: colligo, compono, condo, etc.
- Used in compounds to indicate the completeness, perfecting of any act, and thus gives intensity to the signification of the simple word
- commaculo, commendo, concito, comminuo, concerpo, concido, convello, etc.
con- is a prefix added to many words to give a sense of with or together. The o is long before s and f, whence cōnspīrō and cōnferō. Before b, p, and m, the n assimilates to m (whence com-). Other forms are co-, col- (used before l), and cor- (used before r).
Before the letters b or p use the form com-. Sometimes the co- form is used instead.