twenty-twenty

adjective

twen·​ty-twen·​ty ˈtwen-tē 

ˈtwən-

variants or 20/20

1

of the human eye : meeting a standard of normal visual acuity

twenty-twenty vision

2

: marked by facilely accurate discernment, judgment, or assessment

hindsight is twenty-twenty

Word History

Etymology

from the testing of vision by reading letters at a distance of 20 feet

First Known Use

1875, in the meaning defined at sense 1

Kids Definition

twenty-twenty

adjective

twen·​ty-twen·​ty

ˌtwent-ē-ˈtwent-ē

: having normal visual sharpness

—often written 20/20

Medical Definition

twenty-twenty

adjective

twen·​ty-twen·​ty

variants or 20/20

ˌtwent-ē-ˈtwent-ē 

: having the normal visual acuity of the human eye that according to one common scale can distinguish at a distance of 20 feet characters one-third inch in diameter

twenty-twenty vision