thirteen
Saythur-TEEN/ˌθɝtˈtin/UK/ˌθɜːˈtiːn/
- 1The number that comes after twelve and before fourteen. It equals ten plus three.
There are thirteen kids in my class this year.
She turns thirteen next month and becomes a teenager.
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Origin
From Old English þrēotīene, made from the words for "three" and "teen" (ten).