Definition of mill

• n. - A money of account of the United States, having the value of the tenth of a cent, or the thousandth of a dollar.
• n. - A machine for grinding or comminuting any substance, as grain, by rubbing and crushing it between two hard, rough, or intented surfaces; as, a gristmill, a coffee mill; a bone mill.
• n. - A machine used for expelling the juice, sap, etc., from vegetable tissues by pressure, or by pressure in combination with a grinding, or cutting process; as, a cider mill; a cane mill.
• n. - A machine for grinding and polishing; as, a lapidary mill.
• n. - A common name for various machines which produce a manufactured product, or change the form of a raw material by the continuous repetition of some simple action; as, a sawmill; a stamping mill, etc.
• n. - A building or collection of buildings with machinery by which the processes of manufacturing are carried on; as, a cotton mill; a powder mill; a rolling mill.
• n. - A hardened steel roller having a design in relief, used for imprinting a reversed copy of the design in a softer metal, as copper.
• n. - An excavation in rock, transverse to the workings, from which material for filling is obtained.
• n. - A passage underground through which ore is shot.
• n. - A milling cutter. See Illust. under Milling.
• n. - A pugilistic.
• n. - To reduce to fine particles, or to small pieces, in a mill; to grind; to comminute.
• n. - To shape, finish, or transform by passing through a machine; specifically, to shape or dress, as metal, by means of a rotary cutter.
• n. - To make a raised border around the edges of, or to cut fine grooves or indentations across the edges of, as of a coin, or a screw head; also, to stamp in a coining press; to coin.
• n. - To pass through a fulling mill; to full, as cloth.
• n. - To beat with the fists.
• n. - To roll into bars, as steel.
• v. i. - To swim under water; -- said of air-breathing creatures.