Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Adjective: thirty  thur-tee
  1. Being ten more than twenty
    - 30, xxx
Noun: thirty  thur-tee
  1. The cardinal number that is the product of ten and three
    - 30, XXX

Derived forms: thirties

See also: cardinal

Type of: large integer

Encyclopedia: Thirty, Nine