sine
sahyn
- n ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
- And like sex, it's a sine qua non to keep the species going.
- A happy ending is a sine qua non of romance fiction: girl catches guy, and all is well with the world.
- Congress backed the policy in 1954, and by the 1970s the FCC called the doctrine the "single most important requirement of operation in the public interest the sine qua non for .