- Main Entry:
- thir·ty

- Pronunciation:
-
\ˈthər-tē\
- Function:
- noun
- Inflected Form(s):
- plural thirties
- Etymology:
- Middle English thritty, from thritty, adjective, from Old English thrītig, from thrītig group of 30, from thrīe three + -tig group of ten; akin to Old English tīen ten
- Date:
- before 12th century
1— see number table2plural : the numbers 30 to 39; specifically : the years 30 to 39 in a lifetime or century3: a sign of completion : end —usually written 30 <wrote thirty on the last page of the story>4: the second point scored by a side in a game of tennis
—
thir·ti·eth
\-tē-əth\ adjective or noun
— thirty adjective
— thirty pronoun, plural in construction
—
thir·ty·ish
\-ish\ adjective