mill. 1. A machine that grinds corn, grain, or other substances, esp. using a wheel and circular motion. • The substance ground in a mill is sometimes called grist, esp. when it is a grain. Courts sometimes refer to the grinding process as a metaphor for the judicial process <suits to collect on promissory notes are grist for the summary-judgment mill because the material facts in such cases are often undisputed>. [Cases: Manufactures 2.] 2. The building in which the grinding is performed, along with the site, dam, or other items connected with the mill. 3. The tenth part of a cent.

[Blacks Law 8th]