twenty-oneth

twenty-oneth (not comparable)

1. (nonstandard) twenty-first

twenty-oneth (plural twenty-oneths)

1. (nonstandard) A fractional part of twenty-one, a twenty-first
   • average ministerial age of pastors 22 years and nineteen twenty-oneths ; average pastoral age, 13 years and ten twenty-oneths —"VI. New London Association." In the Minutes of the General Association of Connecticut, at their Meeting in New London: June, 1844. Appendix, p. 32.

• twenty-first