Eighteenth Definition

ā-tēnth
noun
The ordinal number matching the number 18 in a series.
American Heritage
The one following the seventeenth.
Webster's New World
Any one of the eighteen equal parts of something;118
Webster's New World
The person or thing in the eighteenth position.
Wiktionary

(informal) A party to celebrate an eighteenth birthday.

Wiktionary
adjective
Preceded by seventeen others in a series; 18th.
Webster's New World
Designating any of the eighteen equal parts of something.
Webster's New World

The ordinal form of the number eighteen.

Wiktionary
Synonyms:
adverb
In the eighteenth place, rank, group, etc.
Webster's New World

Other Word Forms of Eighteenth

Noun

Singular:
eighteenth
Plural:
eighteenths

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eighteenth