Mature  —adj. (maturer, maturest) 1 a fully developed, adult. B sensible, wise. 2 ripe; seasoned. 3 (of thought etc.) Careful, considered. 4 (of a bill, insurance policy, etc.) Due, payable. —v. (-ring) 1 develop fully; ripen. 2 perfect (a plan etc.). 3 (of a bill, insurance policy, etc.) Become due or payable.  maturely adv. Matureness n. Maturity n. [latin maturus timely]