Length is a measure of distance. In the International System of Quantities, length is a quantity with dimension distance.
Common uses of the term "length" include:
1. The measurement of something from end to end
2. The quality or state of being long
3. In mathematics, the length of a curve or line segment
4. In computing, the number of elements in an array or string
5. In time, the duration of something (e.g., length of a movie)