In geometric measurements, length most commonly refers to the longest dimension of an object.

In certain contexts, the term "length" is reserved for a certain dimension of an object along which the length is measured. For example it is possible to cut a length of a wire which is shorter than wire thickness. Another example is FET transistors, in which the channel width may be larger than channel length.

Length may be distinguished from height, which is vertical extent, and width or breadth, which are the distance from side to side, measuring across the object at right angles to the length.

Length is a measure of one dimension, whereas area is a measure of two dimensions (length squared) and volume is a measure of three dimensions (length cubed). In most systems of measurement, the unit of length is a fundamental unit, from which other units are defined.

Read more about Length:  History, Units

Famous quotes containing the word length:

    At length they all to merry London came,
    To merry London, my most kindly nurse,
    That to me gave this life’s first native source;
    Though from another place I take my name,
    An house of ancient fame.
    Edmund Spenser (1552?–1599)

    The value of life lies not in the length of days but in the use you make of them; he has lived for a long time who has little lived.
    Michel de Montaigne (1533–1592)

    Twenty-four-hour room service generally refers to the length of time that it takes for the club sandwich to arrive. This is indeed disheartening, particularly when you’ve ordered scrambled eggs.
    Fran Lebowitz (b. 1950)