fifty-oneth

adj, noun — 2 senses

fifty-oneth

adj

/ˌfɪfti ˈwʌnθ/

Etymology From fifty-one + -th (ordinal suffix).

1

Nonstandard fifty-first

fifty-oneth

noun

Etymology From fifty-one + -th (ordinal suffix).

1

A fractional part of fifty-one.

But the eye could only divine, could not measure, the difference between the fiftieth of a millimetre and the fifty-oneth, and she wished to measure.1925, M. P. Shiel, The Black Box, page 81:

Synonyms: fifty-first

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.