Mill  —n. 1 a building fitted with a mechanical device for grinding corn. B such a device. 2 device for grinding any solid to powder etc. (pepper-mill). 3 a building fitted with machinery for manufacturing processes etc. (cotton-mill). B such machinery. —v. 1  grind (corn), produce (flour), or hull (seeds) in a mill. 2 (esp. As milled adj.) Produce a ribbed edge on (a coin). 3  cut or shape (metal) with a rotating tool. 4 (often foll. By about, around) move aimlessly, esp. In a confused mass.  go (or put) through the mill undergo (or cause to undergo) intensive work, pain, training, etc. [latin molo grind]