3 days ago · English Dictionary Thesaurus Sentences Grammar Definition of 'Co.' Word Frequency Co. 1. Co. is used as an abbreviation for company when it is part of the name of an organization. [business] the Blue Star Amusement Co. 2. Co. is used as a written abbreviation for county before the names of some counties, especially in Ireland . Co. Waterford. a. : one that is associated in an action with another : fellow : partner. coauthor. coworker. b. : having a usually lesser share in duty or responsibility : alternate : deputy. copilot. 4. : of, relating to, or constituting the complement of an angle. CO: Certificate of Origin: CO: Colchester (postcode, United Kingdom) CO: Cellular One: CO: Clean Out (sewers/drains) CO: Charlotte Observer (newspaper) CO: Cargo Operations: CO: Certificate of Occupancy: CO: Cash Order: CO: Corporación (Spanish) CO: Collection Officer: CO: Comercializadora de Occidente SA (Guatemala) CO: Consumer Ombudsman (UK) OhiiB.

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