mature: [15] ‘Earliness’ is the etymological notion underlying the word mature. It goes back ultimately to a pre-Latin base *mātu-, which produced the Latin adjective mātūrus ‘timely, early’, direct source of the English word (in Old French mātūrus became mur ‘ripe’, which played a part in the emergence of English demure). Another Latin derivative of *mātu- was Mātūta, the name of the Roman goddess of the dawn. From this in turn was derived the adjective mātūtīnus ‘of the morning’, source of English matins [13] and matutinal ‘of the morning’ [17]. => demure, matins
mature (v.)
late 14c., "encourage suppuration;" mid-15c. "bring to maturity," from Latin maturare "to ripen, bring to maturity," from maturus "ripe, timely, early," related to manus "good" and mane "early, of the morning," from PIE root *ma- (1) "good," with derivatives meaning "occurring at a good moment, timely, seasonable, early." Meaning "come or bring to maturity" is from 1620s. The financial sense of "reach the time for payment" is from 1861. Related: Matured; maturing.
mature (adj.)
mid-15c., "ripe," also "careful, well-considered," from Latin maturus "ripe, timely, early" (see mature (v.)).