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    Sine

    /ˈsaɪn/

    Meaning & Definition

    noun
    In trigonometry, sine is a function that relates the angle of a right triangle to the ratio of the length of the side opposite the angle to the length of the hypotenuse.
    The sine of a 30-degree angle is 0.5.
    A mathematical function that describes the wave-like patterns in various fields such as physics and engineering.
    The wave can be described using the sine function to represent its oscillatory nature.
    In geometry, the sine function is often abbreviated as 'sin'.
    The relationship sin(θ) = opposite/hypotenuse is fundamental in trigonometry.

    Etymology

    From Latin 'sinus', meaning 'bay' or 'fold', derived from its geometric interpretation.

    Common Phrases and Expressions

    sine qua non
    An essential condition or element.
    sine die
    Without assigning a day for a further meeting.

    Related Words

    cosine
    A trigonometric function representing the ratio of the length of the adjacent side to the hypotenuse.
    tangent
    A trigonometric function that represents the ratio of the opposite side to the adjacent side.

    Slang Meanings

    A term often used to refer to a close friend in mathematics or physics circles.
    He's my sine; we solve problems together.