From Latin factor (“a doer, maker, performer”), from factus (“done or made”), perfect passive participle of faciō (“do, make”), from Proto-Indo-European *dʰeh₁- (“to put, place, set”).
fatorial m (plural fatoriais)
- (mathematics, combinatorics) factorial (mathematical operation or its result)
fatorial m, f (plural fatoriais; comparable)
- (mathematics) factorial