PIE base ‘to think’, with derivatives referring to various qualities and states of mind and thought. See also *mei-no- ‘to think’.
Other derivatives include mental, mantra, mention, comment, demonstrate, summon, monitor, mania, manic, monster, mosaic, music, museum, automatic, amnesia, and amnesty.
[Pokorny *men-3 ‘to think; mind, spiritual activity’, p. 726–728, *mendh- ‘to direct attention to; vivacious’, p. 730.]