com-
/kɒm/(亦作co-, col-, con-或cor-)
prefix
- with; together; jointly; altogether表示“同”, “与”; “合”; “共”; “全”：
combine
command
collude.
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.
词源
from Latin cum 'with'.