Definition of Acn

ACN is a three-letter acronym that may refer to:

• Accenture (NYSE: ACN)
• Acetonitrile
• Achnasheen railway station (National Rail code: ACN), a United Kingdom railway station
• Acn, abbreviation for the orchid genus Acineta
• ACN Inc., multi-level marketing company selling telecommunications services
• Acrylonitrile
• Action Congress of Nigeria, political party of Nigeria
• Africa Cup of Nations, biennual football tournament held in Africa and organised by the CAF
• Agencia Carabobeña de Noticias, news agency based in Valencia, Venezuela
• Aid to the Church in Need, international Catholic charity based in Königstein im Taunus, Germany
• Aircraft Classification Number, ICAO standard number indicating the pavement load imposed by an aircraft
• American Collectibles Network, former name of the American television network now known as Jewelry Television
• Andean Community of Nations
• Anglican Communion Network, missionary organisation based in Pittsburgh, USA
• Ante Christum Natum, Latin equivalent of B.C., seldom used in English
• Application Context Name (Used in Network/Communication protocols per ETSI standards)
• Architecture for Control Networks, network protocol for theatrical control
• Australian Company Number, number issued by the Australian Securities and Investments Commission to registered companies

Ante Christum Natum (Latin for Before Christ (was) Born), usually abbreviated to A.C.N., a.C.n., a.Ch.n. or ACN, denotes the years before the birth of Jesus Christ. It is the modern Latin equivalent to the English term "BC" ("Before Christ") and "BCE" ("Before Common Era"). The phrase Ante Christum Natum is also seen as the shorter Ante Christum (Latin for "Before Christ"), again usually abbreviated to A.C. or AC. A related term, p.Ch.n or post Christum natum complements a.Ch.n and is equivalent to "AD".