Synonyms for 21st:

• adj.

  •all (adjective)
  • 21st.

• Other synonyms:

  •Other relevant words:
  • twenty-one,
  • blackjack,
  • xxi.

Paraphrases for 21st:

• Equivalence

  • Adjective
    21th.

• Reverse Entailment

  • Adjective
    21st-century.

• Independent

  • Cardinal number
    21., 21.0.
  • Adjective
    20th, 21e, 31st, 19th, 11th.

• Other Related

  • Cardinal number
    21.
  • Adjective
    21.
  • Proper noun, singular
    21.
  • Noun, singular or mass
    21.

Antonyms for 21st:

• Other antonyms:

  • Other antonyms:
    cardinal, ordinal.