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c/o abbreviation of "(in the) care of."
Co symbol of the chemical element cobalt.
CO1 abbreviation of "Colorado," a western U.S. state bordered by Wyoming, Kansas, New Mexico, and Utah.
CO2 abbreviation of "commanding officer," a military officer in charge of a unit or installation.
CO3 abbreviation of "conscientious objector," a person who refuses, for moral or religious reasons, to participate in military service or to engage in warfare.
co- together; with; jointly. [2 definitions]
Co.1 abbreviation of "Company," a business firm (used in a proper name).
Co.2 abbreviation of "County," a subdivision of a U.S. state for purposes of local administration and government (used in a proper name). [2 definitions]
Colorado a western U.S. state bordered by Wyoming, Kansas, New Mexico, and Utah. (abbr.: CO) [2 definitions]