ABC¹ /ā-bē-sēˈ/ also (obsolete) abcee or absey /abˈsi/

1. The alphabet, so named from its first letters
2. A first reading-book
3. Hence, the rudiments or the basics
4. Anything arranged alphabetically, such as an acrostic or a railway guide

absey book noun (Shakespeare)

A primer or hornbook

ABC²

1. American Broadcasting Company
2. Arab Banking Corporation
3. Associated British Cinemas
4. Audit Bureau of Circulations
5. Australian Broadcasting Corporation (formerly, Commission)

• DNA virus
• DNB
• D-Notice
• DNR
• Dnr
• DNS
• do
• Do.
• DOA
• doab
• doable
• doabs
• do a candle
• do a flanker
• do-all
• do-alls
• do a Melba
• do a number on
• do a perish
• do a roaring trade
• do a runner
• do as though it were going out of fashion
• doat
• doated
• doater