Continually fresh or self-renewing; often used metaphorically.
Of a document or dataset, continually up-to-date (as opposed to being published at regular intervals and being slightly outdated in-between those publication dates)
(broadcasting) Suitable for transmission at any time; not urgent or time-dependent.
2001, Christopher H Sterling, John M Kittross, Stay Tuned (Lawrence Erlbaum Associates 2001, p. 654)Another change in the news was emphasis on “evergreen†features involving attractive children or animals, parades or fireworks, as well as local developments.
Antonyms
(of plants, that do not shed their leaves) deciduous
1958: Chuck Berry, Johnny B. GoodeDeep down in Louisiana, close to New Orleans,Way back up in the woods among the evergreens,There stood a log cabin made of earth and woodWhere lived a country boy named Johnny B. Goode
(colloquial) A news story that can be published or broadcast at any time.