Not having expired. / Of food: not having reached its expiry date. / Of an agreement, coupon, or law, still in force.

Third-person singular simple present indicative form of unexpire

(transitive, computing) To cause (a password or other setting) no longer to be expired; to restore as valid.

present participle of unexpire

(finance) The unused part of the economic benefit of an expenditure that remains as an asset for future use

plural of unexpired cost