Spelling.School · How to spell
How to spell ninetieth
Ninetieth is spelled N-I-N-E-T-I-E-T-H. The part people get wrong: I before E.
What it means: Coming next after the eighty-ninth.
In a sentence: It was Emma's ninetieth step in the game.
The part people get wrong
Watch for the order of ie.
Same family: nine, nineteen, ninth, nineties, ninety-one. If you can spell one, the shared part carries to the others.
Where it comes from: Ninetieth comes from the Old English pattern of adding the ending “-eth” to number words to form ordinals, like tenth and hundredth. The base “ninety” itself goes back to Old English “nigontig,” meaning “nine tens.”
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