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Definition of niner

niner

/ˈnaɪ.nər/
ni · ner
Plural:niners
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niner Lexical Profile

niner Game Scores & Validity

• noun

1

A clear spoken form of the number nine used in aviation, maritime, and radio communications to ensure clarity and prevent confusion with other words.

Example

"The air traffic controller cleared the passenger jet to land on runway two-niner."

2

North American A bicycle equipped with large twenty-nine-inch wheels, typically used for off-road or mountain cycling (short for 'twenty-niner').

Example

"She switched to a lightweight carbon niner to roll more smoothly over rocky mountain trails."

Synonyms
View all synonyms for niner

• Rhymes for niner

• Nearby Words

nine-banded armadillo
ninefold
ninepins
niner
nineteen
nineteenth
nineties

Word Origin & Etymology

Coined in the early 20th century by adding the suffix -er to 'nine', adopted into aviation and NATO radiotelephony protocols to prevent confusion with the German negative 'nein' over noisy radio channels.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

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