(rail transport) A wheel arrangement for diesel and electric locomotives signifying that a locomotive has six axles, each powered by a motor, on two bogies.

plural of Co-Co

(pharmacology) a shortened allomorph of the monoclonal antibody affix -col-, used before the affixes -xi- and -zu- for ease of pronunciation

(derogatory) Church of Scientology

(nonstandard) Belonging to co. Gender-neutral possessive adjective, grammatically equivalent to the gendered his and her and the singular their.

Abbreviation of company. / Abbreviation of county.

(colloquial) Clipping of company.

Abbreviation of Colorado. A state of the United States.

Abbreviation of county. / (military) Initialism of commanding officer. / (military) Initialism of commissioned officer. / (US, law enforcement) Initialism of corrections officer.

Abbreviation of company, alternative form of Co. / Abbreviation of county, alternative form of Co.