Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Being in the process of passing out of use or usefulness; becoming obsolete.
  • adj. Biology Gradually disappearing; imperfectly or only slightly developed. Used of an organ or other part of an animal or plant.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. In the process of becoming obsolete, but not obsolete yet.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Going out of use; becoming obsolete; passing into desuetude.

from The Century Dictionary and Cyclopedia

  • Becoming obsolete; passing out of use: as, an obsolescent word or custom.
  • In entomology, somewhat obsolete; imperfectly visible.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. becoming obsolete

Etymologies

Latin obsolēscēns, obsolēscent-, present participle of obsolēscere, to fall into disuse : ob-, away; see ob- + solēre, to be accustomed to.
(American Heritage® Dictionary of the English Language, Fourth Edition)
First attested circa 1780, from Latin obsolescentum. (Wiktionary)

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