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Definitions of sine:

noun: ratio of the opposite side to the hypotenuse of a right-angled triangle
name: A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #9901)

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Alternative Terms
condition essential must necessity need precondition prerequisite requirement requisite necessary-unnecessary but-for-rule latin law english-language german-language french-language italian-language spanish-language classical-latin-2 andrew-jackson harvard-university e-pluribus-unum adventure-quest united-kingdom proximate-cause sine-qua-non-rule battle-of-britain dayak hypnoid-states sergei-semenovich-uvarov janet-malcolm glastonbury-scripts causa headhunting skull-shaping zone-system