Definitions from Wiktionary (REF)

▸ verb:  (informal, ambitransitive) To referee; to act as a referee in a sport or game.
▸ noun:  A surname.
▸ noun:  (informal) Clipping of referee. [(sports) An umpire or judge; an official who makes sure the rules are followed during a game.]
▸ noun:  Abbreviation of reference. [(literary or archaic) A relationship or relation (to something).]
▸ noun:  Abbreviation of refsheet. [(fandom slang) An image showing an original character from different angles, intended to be used as a reference when drawing them.]
▸ noun:  Abbreviation of refectory. [A dining hall, especially in an institution such as a college or monastery.]
▸ noun:  (Philippines, informal) Clipping of refrigerator. [A household or commercial appliance used for keeping food fresh by refrigeration (short form fridge).]
▸ noun:  (mathematics, linear algebra) Initialism of row echelon form. [(linear algebra) The stepped appearance of a matrix that has undergone Gaussian elimination with the result that the leading coefficient or pivot (that is, the first nonzero number from the left) of a nonzero row is to the right of the pivot of the row above it.]
▸ noun:  (UK, education) Initialism of Research Excellence Framework: a system for assessing the quality of research in higher-education institutions.

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