noun
niner
NEYE-nuh
noun
1
The digit 9, spoken this way in radio and aviation communication to avoid confusion with other numbers.
"The pilot read back the frequency as "one-two-niner.""
How to Use Niner
Learner’s notesIn plain EnglishHow pilots, soldiers, and radio operators say the number 9 to keep it perfectly clear.
Word Forms
niners plural
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The pilot read back the frequency as "one-two-_____."
Etymology
Formed from nine + -er, adopted in radio-telephony because "nine" can sound like other words over crackly audio.