mod

(uncountable) An unconventionally modern style of fashionable dress originating in England in the 1960s, characterized by ankle-length black trenchcoats and sunglasses.

(UK) A 1960s British person who dressed in such a style and was interested in modernism and the modern music of the time; the opposite of a rocker.

(informal) Clipping of modification.

(video games) An end user-created package containing modifications to the look or behaviour of a video game.

(Internet) A moderator, for example on a discussion forum.

(computing, informal) A module (file containing a tracker music sequence).

(rock climbing) A moderately difficult route.

(in the plural, Oxford University, informal) Moderations: university examinations generally taken in the first year.

(mathematics, programming) Abbreviation of modulus.

(statistics) Abbreviation of mode.