means The state of being fully grown, developed, or ripe — whether in a person, an idea, a fruit, or a financial debt reaching its due date.

from From Latin maturus, 'ripe, timely, of due season,' which gave us maturitas, 'ripeness.' The same root sits behind 'matins' (the early-morning prayers) and the name Matuta, the Roman goddess of dawn — all circling the idea of something arriving at its proper, ready time. So a mature person and a ripe peach share a Latin grandparent, both having finally come due.