Abbreviation of twenty-twenty.

The decade of the 2020s. / The decade of the 1920s. / Temperatures from 20 to 29 degrees. / Ages between 20 and 29.

Alternative spelling of 20s

(idiomatic) In hindsight things are obvious that were not obvious from the outset; one is able to evaluate past choices more clearly than at the time of the choice.

(CB slang) Location.

(physics) The major stable isotope of neon, ²⁰₁₀Ne, having ten protons and ten neutrons; it amounts to over 90% of the element in nature

Alternative form of 20s

Alternative form of 420

plural of 10-20

Alternative form of 420