twenty

twen‧ty /ˈtwenti/ BrE AmE number, noun
[Language: Old English; Origin: twentig]
1. the number 20:
a small village twenty miles from Nairobi
I’m nearly twenty (=20 years old).
2. the twenties [plural] (also the 20s, the 1920s) the years from 1920 to 1929:
In the twenties the business expanded.
the early/mid/late twenties
The photograph was taken in the late twenties.
3. be in your twenties to be aged between 20 and 29
early/mid/late twenties
She was in her early twenties when I met her.
4. in the twenties if the temperature is in the twenties, it is between 20 degrees and 29 degrees
in the low/mid/high twenties
a warm day, with temperatures in the low twenties
5. [countable] a piece of paper money that is worth £20 or $20:
I offered the driver a twenty.
—twentieth adjective, pronoun:
in the twentieth century
her twentieth birthday
I’m planning to leave on the twentieth (=the 20th day of the month).

Oxford Advanced Learner's Dictionary

twenty

twenty [twenty twenties] [ˈtwenti] ; [ˈtwenti]

1. number 20

2. noun the twenties plural numbers, years or temperatures from 20 to 29
Idiom: in your twenties

Derived Word: twentieth

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition

twenty / ˈtwen.ti / / -t̬i / number

A1 the number 20:

nineteen, twenty, twenty-one

space for twenty people

→ See also score noun (TWENTY)

Collins Advanced Learner’s English Dictionary

twenty

[twe̱nti]
♦
twenties
1) NUM Twenty is the number 20.
2) N-PLURAL When you talk about the twenties, you are referring to numbers between 20 and 29. For example, if you are in your twenties, you are aged between 20 and 29. If the temperature is in the twenties, the temperature is between 20 and 29 degrees.
They're both in their twenties and both married with children of their own.
3) N-PLURAL: the N The twenties is the decade between 1920 and 1929.
It was written in the Twenties, but it still really stands out.

Merriam-Webster's Advanced Learner's Dictionary

twenty

twen·ty /ˈtwɛnti/ noun, pl -ties
1 [count] : the number 20
2 [count] : the 20th in a set or series
• item/question twenty
3 twenties [plural]
a : the numbers ranging from 20 to 29
• Tomorrow the temperature will be in the low twenties.
b : a set of years ending in digits ranging from 20 to 29
• She's in her twenties.
• the gangsters of the twenties [=of the 1920s]
4 [count]
a US : a twenty-dollar bill
• All I have is a twenty.
b Brit : a twenty-pound note
- twen·ti·eth /ˈtwɛntijəɵ/ noun, pl -eths [count]
• What are you doing on the twentieth? [=the twentieth day of the month]
• a twentieth of the population
- twentieth adj
• their twentieth anniversary
- twenty adj
• It was a twenty-hour flight.
• twenty days later
- twenty pronoun
• Only twenty showed up for the review session.
• We spent forty dollars and had twenty left.