A B C \A B C"\ ([=a] b[=e] s[=e]").

1. The first three letters of the alphabet, used for the whole alphabet. [1913 Webster]

2. A primer for teaching the alphabet and first elements of reading. [Obs.]

[1913 Webster]

3. The simplest rudiments of any subject; as, the A B C of finance. [1913 Webster]

A B C book, a primer. --Shak. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

A B C \A B C"\ ([=a] b[=e] s[=e]").

1. The first three letters of the alphabet, used for the whole alphabet.

2. A primer for teaching the alphabet and first elements of reading. [Obs.]

3. The simplest rudiments of any subject; as, the A B C of finance.

A B C book, a primer. --Shak.

Source: Webster's Revised Unabridged Dictionary (1913)