The cardinal number 20, occurring after nineteen and before twenty-one.

(colloquial) A banknote with a denomination of 20. / (CB slang) 10-20 (location). / (UK, historical, military) An old English division of infantry.

Having normal visual acuity.

A hamlet in Bourne parish, South Kesteven district, Lincolnshire, England (OS grid ref TF1520).

(idiomatic) Perfect understanding of events only after they have happened.

Obsolete spelling of twenty

From or evoking the 21st through 30th years of a century (chiefly the 1920s).

plural of twenty

The decade of the 1820s, 1920s, 2020s, etc. / The decade of one's life from age 20 through age 29. / (temperature, rates, plural only) The range between 20 and 29.

(archaic) Twenty-four. (24)