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ob·so·les·cent  (bs-lsnt)
1. Being in the process of passing out of use or usefulness; becoming obsolete.
2. Biology Gradually disappearing; imperfectly or only slightly developed. Used of an organ or other part of an animal or plant.

[Latin obsolscns, obsolscent-, present participle of obsolscere, to fall into disuse : ob-, away; see ob- + solre, to be accustomed to.]

obso·lescence n.
obso·lescent·ly adv.

obsolescence  /bslsns/  n. [U] the process of becoming no longer useful: The obsolescence of buildings happens over many years, as they become too old to use. -v. [I] obsolesce; -adj. obsolescent. obsolescence

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