WordNet sense 1 (Scottish philosopher who expounded Bentham's utilitarianism; father of John Stuart Mill (1773-1836)):

James Mill

WordNet sense 2 (English philosopher and economist remembered for his interpretations of empiricism and utilitarianism (1806-1873)):

John Mill, John Stuart Mill

WordNet sense 3 (machinery that processes materials by grinding or crushing):

grinder, milling machinery

WordNet sense 4 (a plant consisting of one or more buildings with facilities for manufacturing):

factory, manufactory, manufacturing plant

WordNet sense 5 (move about in a confused manner):

mill about, mill around

WordNet sense 6 (the act of grinding to a powder or dust):

grind, pulverization, pulverisation