say it: AY-bee-seez
abc's is a noun meaning "the elementary stages of any subject (usually plural)". It carries one recorded sense.
the elementary stages of any subject (usually plural)
“he mastered only the rudiments of geometry”
plural
Definitions, synonyms and semantic relations for abc's come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.