"building fitted to grind grain," Old English mylen "a mill" (10c.), an early Germanic borrowing from Late Latin molina, molinum "mill" (source of French moulin, Spanish molino), originally fem. and neuter of molinus "pertaining to a mill," from Latin mola "mill, millstone," related to molere "to grind," from PIE *mele-, *mel- "to crush, grind," with derivatives referring to ground material and tools for grinding (cf. Greek myle "mill;" see mallet).
Also from Late Latin molina, directly or indirectly, are German Mühle, Old Saxon mulin, Old Norse mylna, Danish mølle, Old Church Slavonic mulinu. Broader sense of "grinding machine" is attested from 1550s. Other types of manufacturing machines driven by wind or water, whether for grinding or not, began to be called mills by early 15c. Sense of "building fitted with industrial machinery" is from c.1500.
"to grind," 1550s, from mill (n.1). Related: milled; milling.
"to keep moving round and round in a mass," 1874 (implied in milling), originally of cattle, from mill (n.1) on resemblance to the action of a mill wheel. Related: Milled.
A million dollars: That'll cost the government a cool six mill (1955+)
for grinding corn, mentioned as used in the time of Abraham (Gen. 18:6). That used by the Hebrews consisted of two circular stones, each 2 feet in diameter and half a foot thick, the lower of which was called the "nether millstone" (Job 41:24) and the upper the "rider." The upper stone was turned round by a stick fixed in it as a handle. There were then no public mills, and thus each family required to be provided with a hand-mill. The corn was ground daily, generally by the women of the house (Isa. 47:1, 2; Matt. 24:41). It was with the upper stone of a hand-mill that "a certain woman" at Thebez broke Abimelech's skull (Judg. 9:53, "a piece of a millstone;" literally, "a millstone rider", i.e., the "runner," the stone which revolves. Comp. 2 Sam. 11:21). Millstones could not be pledged (Deut. 24:6), as they were necessary in every family.