I. ˈthər]d.]ē, ˈthə̄], ˈthəi], ]t], ]i\ adjective
Etymology: Middle English thirty, thritty, from Old English thrītig, from thrītig, n., group of 30, from thrīe, thrēo three + -tig group of 10 — more at three , eighty
: being one more than 29 in number
thirty years
— compare number table
II. pronoun, plural in construction
Etymology: Middle English thirty, thritty, from Old English thrītig, from thrītig, n. & adjective
: 30 countable persons or things not specified but under consideration and being enumerated
thirty are here
thirty were found
III. noun
( -es )
Etymology: Middle English thritty, from Old English thrītig, from thrītig, adjective
1. : three tens : twice 15 : five times six : six fives
2.
a. : 30 units or objects
a total of thirty
b. : a group or set of 30
arranged by thirties
3. : the numerable quantity symbolized by the arabic numerals 30
4. thirties plural
a. : the numbers 30 to 39 inclusive
a score in the thirties
low grades in the thirties
b. : the members of a series or set of successive numbers that end in 30 to 39 inclusive
the thirties of the preceding century
lives in the thirties in the next block
c. : the portion of a continuum lying between 30 and 40 on a scale of measurement or segmentation
temperatures in the thirties tomorrow
a man in his thirties
dresses selling in the thirties
in the latitude of the thirties
5. : the 30th in a set or series ; especially : an article of clothing of the 30th size
wears a thirty
6. : something having as an essential feature 30 units or members
7.
a. : a mark or sign of completion
“Thank you, Mr. President” the traditional thirty closing press conferences — Ethyl News
b. : end , conclusion
had thirty written on their earthly life — Trade Compositor
8. : the second point scored by a side in tennis
9. : a 30 caliber machine gun — usually written .30