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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.

Synonyms:

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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