Definitions:

1. the elementary stages of any subject; usually plural noun
   • They mastered only the rudiments of geometry.
2. the remains of a body part that was functional at an earlier stage of life noun
   • Meckel's diverticulum is the rudiment of the embryonic yolk sac

Synonyms:

• ABC
• ABC's
• ABCs
• alphabet
• first principle
• first rudiment

NearBy Words:

• rudimentary
• rudiments