eighteen

eigh‧teen /ˌeɪˈtiːn◂/ BrE AmE number
[Language: Old English; Origin: eahtatiene, from eahta 'eight' + tien 'ten']
the number 18:
At least eighteen bullets were fired.
Jim was eighteen (=18 years old).
—eighteenth adjective, pronoun:
in the eighteenth century
her eighteenth birthday
I’m planning to leave on the eighteenth (=the 18th day of the month).

Oxford Advanced Learner's Dictionary

eighteen

eight·een [eighteen eighteens] [ˌeɪˈtiːn] [ˌeɪˈtiːn] number
18
Derived Word: eighteenth
Word Origin:

Old English e(a)htatēne (from eight and -teen).

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition

eighteen / ˌeɪˈtiːn / number

A1 the number 18:

You are allowed to vote at eighteen (= when you are 18 years old)

The table was set for eighteen people.

Collins Advanced Learner’s English Dictionary

eighteen

[e͟ɪti͟ːn]
♦
NUM
Eighteen is the number 18.
He was employed by them for eighteen years.

Merriam-Webster's Advanced Learner's Dictionary

eighteen

eigh·teen /ˌeɪtˈtiːn/ noun, pl -teens [count] : the number 18
- eighteen adj
• eighteen years
- eighteen pronoun
• Eighteen (of them) were present.
- eigh·teenth /ˌeɪtˈtiːnɵ/ noun, pl -teenths [count]
• one eighteenth of the total
- eighteenth adj
• the eighteenth day
- eighteenth adv
• He finished eighteenth in the race.