[1] : WordNet (r) 2.0

abc's
     n : the elementary stages of any subject usually plural; "he
         mastered only the rudiments of geometry" syn: rudiment,
          first rudiment, first principle, alphabet, abc,
         abcs
see also:
rudiment first rudiment first principle alphabet abc abcs 

[2] : WordNet (r) 2.0

abcs
     n : the elementary stages of any subject usually plural; "he
         mastered only the rudiments of geometry" syn: rudiment,
          first rudiment, first principle, alphabet, abc,
         abc's
see also:
rudiment first rudiment first principle alphabet abc abc's 

Abcs >> A Words
Abcs, definition of term: Abcs
abcs_pag1.html