1 (one)

(n.) = 1 (uno)
Ex: The student/teacher ratio at John Brown is 21 to 1.
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* 1/2 (half) = mitad, la
* 1/2 (one-half) = la mitad (1/2), medio
* 1/3 (a third) = un tercio (1/3)
* 1/3 (one third) = un tercio (1/3), una tercera parte
* 1/4 (one fourth) = una cuarta parte, un cuarto, 1/4
* 1/4 (one-quarter) = una cuarta parte, un cuarto, 1/4
* 1st (first) = 1º (primero)
* 1st-order [first-order] = de primer orden