The ordinal form of the number fifty.

(music theory) A sequence of bass notes at intervals of a perfect fifth lower than the previous note. In equal temperament the sequence repeats every twelve tones, forming a cycle.

The fifth and typically highest gear of an engine.

The fifth amendment to the United States Constitution, which covers several rights, but is used most often quoted regarding the right against self-incrimination.

In the fifth place; fifth in a row.

Half and half. / To describe 2 possible outcomes as being equally likely.

In half: in two equal parts, shares, etc.

(sports) A challenge between two opposing players, where both have an equal chance of taking possession.

(slang) An 1800-ml bottle of spirits, especially sake.

plural of fifteen