Eighty-first Definition

abbreviation
81st, 81st.
Wiktionary
noun

(fractional) One of eighty-one equal parts of a whole.

An eighty-first of 1620 is 20.
Wiktionary

Other Word Forms of Eighty-first

Noun

Singular:
eighty-first
Plural:
eighty-firsts

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eighty-first