n (uncountable) A specialized animal tissue with high lipid content, used for long-term storage of energy: fat tissue.
n Such tissue as food: the fatty portion of (or trimmings from) meat cuts.
n (countable) A lipid that is solid at room temperature, which fat tissue contains and which is also found in the blood circulation; sometimes, a refined substance chemically resembling such naturally occurring lipids.
n That part of an organization deemed wasteful.
n (slang) An erection.
n (golf) A poorly played shot where the ball is struck by the top part of the club head. (see also thin, shank, toe)
n The best or richest productions; the best part.
n (dated, printing) Work containing much blank, or its equivalent, and therefore profitable to the compositor.
n (informal, derogatory) A fat person.
n A beef cattle fattened for sale.
n (obsolete) A large tub or vessel for water, wine, or other liquids; a cistern.
n (obsolete) A dry measure, generally equal to nine bushels.
n Any of a series of file systems that use one or more FATs.
n (genetics, biochemistry) Any of a series of genes and their equivalent proteins that are associated with cell proliferation.
n (computing) Acronym of File Allocation Table or file allocation table.
n (countable, property law, England & Wales) Initialism of full agricultural tenancy. [(property law, England & Wales) An agricultural tenancy agreed before 1 September 1995, to which the Agricultural Holdings Act 1986 applies.]