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.

Measurement has been important ever since man settled from his nomadic lifestyle and started using building materials; occupying land and trading with his neighbours. As society has become more technologically oriented much higher accuracies of measurement are required in an increasingly diverse set of fields, from micro-electronics to interplanetary ranging.

Walter Elias "Walt" Disney (December 5, 1901 – December 15, 1966) was an American film producer, director, screenwriter, voice actor, animator, entrepreneur, entertainer, international icon, and philanthropist, well known for his influence in the field of entertainment during the 20th century. Along with his brother Roy O. Disney, he was co-founder of Walt Disney Productions, which later became one of the best-known motion picture producers in the world. The corporation is now known as The Walt Disney Company and had an annual revenue of approximately US$36 billion in the 2010 financial year.

Disney is particularly noted as a film producer and a popular showman, as well as an innovator in animation and theme park design. He and his staff created some of the world's most well-known fictional characters including Mickey Mouse, for whom Disney himself provided the original voice. During his lifetime he received four honorary Academy Awards and won 22 Academy Awards from a total of 59 nominations, including a record four in one year, giving him more awards and nominations than any other individual in history. Disney also won seven Emmy Awards and gave his name to the Disneyland and Walt Disney World Resort theme parks in the U.S., as well as the international resorts Tokyo Disney Resort, Disneyland Paris, and Hong Kong Disneyland.

Thomas Cruise Mapother IV ( /ˈtɒməs ˈkruːz ˈmeɪpɒθər/; born July 3, 1962), widely known as Tom Cruise, is an American film actor and producer. He has been nominated for three Academy Awards and has won three Golden Globe Awards for the same movies: Born on the Fourth of July (1989), Jerry Maguire (1996), Magnolia (1999). He started his career with the movie Endless Love. Cruise's first appearance in a major film was in 1981's Taps. His first leading role was in the film Risky Business, released in August 1983. Cruise played the role of a heroic naval pilot in the popular and successful 1986 film Top Gun, and also secret agent Ethan Hunt in the series of Mission: Impossible action films.

He has starred in a variety of other successful films, including: Rain Man (1988), Days of Thunder (1990), A Few Good Men (1992), Vanilla Sky (2001), Minority Report (2002), The Last Samurai (2003), Collateral (2004), and War of the Worlds (2005).

Since 2005, Cruise and Paula Wagner have been in charge of the United Artists film studio, with Cruise as producer and star and Wagner as the chief executive. Cruise is also known for his support of and adherence to the Church of Scientology.