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Meanings and definitions for HCO

Hobart Chamber Orchestra
Hollywood Chamber Orchestra
Aldehyde (HCO-)
Harvard College Observatory
Hearing carry over, a type of telecommunications relay service
Heliocentric orbit, an orbit around the Sun
Holocene climatic optimum
Handball Club Odense, a Danish handball club
Hans Christian Ørsted Institute (HCØ)
Hollister Co., an American lifestyle brand
National Socialist Society (Russian: Национал-социалистическое общество, НСО)
Hanwell Community Observatory, a public outreach astronomy organisation; see Hanwell, Oxfordshire
Hubbard Communications Office, an organization in the Church of Scientology
Health Care Organization
The Hong Kong High Court Ordinance.