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Definition of co:

  1. A form of the prefix con, and means, with; together; together with; co is used before a vowel and h, as coalesce, cohabit, and is often separated from the word by a hyphen, as co- operate, co- partner; in math., co is an abbreviation of complement, as co- latitude, co- sine, co- tangent. Note.- The prefix con assumes the various forms of co, cog, col, com, cor, according to the first letter of the second element of the compound; but, 1, con becomes com before b and p, as combustion, compel; 2, con is retained before j and v, except in comfort, as conflict, convene; 3, con is retained before t, d, q, g, and s, as content, condole, conquest, congeal, consent.


big business, the borderland, Colorado, the biz, Ariz., carbonic acid gas, CA, acquisition, brigadier, brigadier-general, AR, blue chip, carbon monoxide, Ala., airspace, affiliate, breadbasket, cobalt, centennial state, Cdr., account, country, carbon dioxide, area, AK, colonel, base, Alas., conscientious objector, belt, district, aide-de-camp, atomic number 27, adjutant, chief of staff, AL, agency, Col., corridor, B.C., agent, AZ, anchor, carbon monoxide gas, county, captain, Ark..

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