c.o.

1. care of.

2. carried over.

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C.O. UK [ˌsiː ˈəʊ] US [ˌsi ˈoʊ] noun [countable] [singular C.O. plural C.O.s]

Commanding Officer: an officer in charge of a military unit

Thesaurus: officers in the armed forces_hyponym

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co-,

prefix. a form of com- (Cf. ↑com-).

1. with; together: »

Cooperate = to act with or together.

2. joint; fellow: »

Coauthor = a joint or fellow author.

3. equally: »

Coextensive = equally extensive.

4. Mathematics. complement: »

Cosine = sine of the complement (of a given angle or arc).

╂[< Latin co-, variant of com- with < cum with]

c/o (no periods) or c.o.,

1. carried over.

2. in care of.

Co (no period),

cobalt (chemical element).

Co. or co.,

1. company.

2. county.

CO (no periods) or C.O.,

an abbreviation for the following:

1. cash order.

2. Colorado (with postal Zip Code).

3. commanding officer.

4. Informal. conscientious objector.