Definition of com- in English:

com-

Pronunciation: /kɒm, kəm/
(also co-, col-, con-, or cor-)

prefix

With; together; jointly; altogether: combine command collude

Origin

from Latin cum 'with'.

Usage

Com- is used before b, m, p, also occasionally before vowels and f. The following variant forms occur: co- especially before vowels, h, and gn; col- before l; cor- before r; and con- before other consonants.

Definition of com- in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict