sine
n. countable C1 Advanced US //ˈsaɪn// UK //sˈaɪn// sine
n. a math term used to describe the relationship between the angles and sides of a right-angled triangle. It is the length of the side opposite an angle divided by the longest side.
n. a trigonometric function representing the ratio of the side opposite a given angle to the hypotenuse in a right-angled triangle.
You need to calculate the sine of the angle to find the height.
In trigonometry class, students learn how to use the sine function to determine the unknown lengths of triangle sides.
The oscillation of a pendulum can be modeled using a sine wave, which represents periodic motion as a function of time or distance.
Usage
Often abbreviated as 'sin' in mathematical notation and formulas.