early 15c., "regular, systematic treatment of disease," from Latin methodus "way of teaching or going," from Greek methodos "scientific inquiry, method of inquiry, investigation," originally "pursuit, a following after," from meta "in pursuit or quest of" (see meta-) + hodos "a method, system; a way or manner" (of doing, saying, etc.), also "a traveling, journey," literally "a path, track, road," a word of uncertain origin (see Exodus).
Meaning "any way of doing anything, orderly regulation of conduct with a view to the attainment of an end" is from 1580s; that of "orderliness, regularity" is from 1610s. Meaning "a system or complete sent of rules for attaining an end" is from 1680s. In reference to a theory of acting associated with Russian director Konstantin Stanislavski (1863-1938), it is attested from 1923.
1560s, "pertaining to or characterized by method," from French methodique and directly from Late Latin methodicus, from Greek methodikos, from methodos (see method). Meaning "systematic, orderly" is by 1660s. Related: Methodically.
Greek goddess personifying prudence, first wife of Zeus, from Greek Mētis, literally "advice, wisdom, counsel; cunning, skill, craft," from PIE root *me- (2) "to measure."
early 15c., "pertaining to versification, characterized by poetic measure or rhythm," from Latin metricus "metrical," from Greek metrikos "of or for meter, metrical," from metron "poetic meter" (from PIE root *me- (2) "to measure"). Old English had meterlic in this sense. Meaning "pertaining to measure or the use of weights and measures" is from 1640s. Related: Metrically.
1580s, a variant spelling of metal. Both forms of the word were used interchangeably (by Shakespeare and others) in the literal sense and in the figurative one of "stuff of which a person is made, (a person's) physical or moral constitution" (1550s), hence "natural temperament," specifically "ardent masculine temperament, spirit, courage" (1590s). The spellings diverged early 18c. and this form took the figurative sense. Related: Mettled.
1768, "penitence, spiritual conversion," from Greek metanoia "afterthought, repentance," from metanoein "to change one's mind or purpose," from meta, here indicating "change" (see meta-) + noein "to have mental perception," from noos "mind, thought," which is of uncertain origin.