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Definition of ninetieth

ninetieth

/ˈnaɪn.ti.əθ/
nine · ti · eth
Plural:ninetieths
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ninetieth Lexical Profile

ninetieth Game Scores & Validity

• adjective

1

Constituting number ninety in a sequence; coming immediately after the eighty-ninth in position or order.

Example

"The community gathered at the town hall to celebrate the library's ninetieth anniversary."

• noun

1

The person or thing in the ninetieth position in a sequence, or the ninetieth day of a given period.

Example

"Her latest painting was the ninetieth to be cataloged for the museum's upcoming retrospective."

2

One of ninety equal parts into which a whole may be divided.

Example

"Even a single ninetieth of a degree of arc can make a measurable difference in astronomical calculations."

• Nearby Words

nineteen
nineteenth
nineties
ninetieth
ninety
ninetyfold
ningbo

Word Origin & Etymology

From Middle English nintieth, reshaped from Old English hundnigontigotha by combining ninety with the ordinal suffix -eth.

Cite this Entry

Wordmom. (2026). Definition of Ninetieth. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/ninetieth
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