Trademark. American Broadcasting Companies: a television and radio network.
2.
atomic, biological, and chemical:
ABC warfare.
British Dictionary definitions for ABC's
ABC1
noun
1.
(pl in US) the rudiments of a subject
2.
an alphabetical guide to a subject
3.
(often pl in US) the alphabet
ABC2
abbreviation
1.
(formerly, of weapons or warfare) atomic, biological, and chemical
2.
Australian Broadcasting Corporation
3.
American Broadcasting Company
4.
Audit Bureau of Circulation
5.
(Austral) Australian-born Chinese: a person with Chinese parents, born and raised in Australia
6.
(US) American-born Chinese: a person with Chinese parents, born and raised in the US
7.
(Brit) acceptable behaviour contract: a voluntary written agreement between someone who has been involved in anti-social behaviour and a local agency such as a housing association, council, or police
Word Origin and History for ABC's
ABC
"the alphabet," late 13c., abece. Sense "rudiments or fundamentals (of a subject)" is from late 14c. From 1944 (in a "Billboard" headline) as a shortening of American Broadcasting Company. Related: ABCs.