obsolete, obsolescent
Both words are derived from Latin obsolescere meaning ‘to fall into disuse’. Something (either physical, such as a piece of machinery, or conceptual, such as a custom or idea) is obsolete when it is outdated and no longer used. It is obsolescent when it is falling out of use, i.e. is becoming obsolete but is not yet actually so.

Modern English usage. 2014.

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  • obsolescent — index obsolete, outdated, outmoded Burton s Legal Thesaurus. William C. Burton. 2006 obsolescent …   Law dictionary

  • Obsolescent — Ob so*les cent, a. [L. obsolescens, entis, p. pr. of obsolescere, to wear out gradually, to fall into disuse; ob (see {Ob }) + solere to use, be wont.] Going out of use; becoming obsolete; passing into desuetude. [1913 Webster] …   The Collaborative International Dictionary of English

  • obsolescent — (adj.) 1755, from L. obsolescentum (nom. obsolescens), prp. of obsolescere fall into disuse (see OBSOLETE (Cf. obsolete)) …   Etymology dictionary

  • obsolescent — ► ADJECTIVE ▪ becoming obsolete. DERIVATIVES obsolesce verb obsolescence noun. ORIGIN from Latin obsolescere fall into disuse …   English terms dictionary

  • obsolescent — [äb΄sə les′ənt] adj. [L obsolescens] in the process of becoming obsolete obsolescence n. obsolescently adv …   English World dictionary

  • obsolescent — obsolescence [ ɔpsɔlesɑ̃s ] n. f. • 1958; mot angl. (1828), du lat. obsolescere « tomber en désuétude » ♦ Didact. Fait de devenir périmé. Spécialt (Écon.) Pour un bien, Fait d être déprécié, périmé pour des raisons indépendantes de son usure… …   Encyclopédie Universelle

  • obsolescent — obsolescence ob‧so‧les‧cence [ˌɒbsəˈlesns ǁ ˌɑːb ] noun [uncountable] when a product, system etc is becoming no longer useful because something better is available, possible etc: • Now markets are subject to the faster obsolescence of products… …   Financial and business terms

  • obsolescent — obsolescently, adv. /ob seuh les euhnt/, adj. 1. becoming obsolete; passing out of use, as a word: an obsolescent term. 2. becoming outdated or outmoded, as machinery or weapons. 3. Biol. gradually disappearing or imperfectly developed, as… …   Universalium

  • obsolescent — [[t]ɒ̱bsəle̱s(ə)nt[/t]] ADJ If something is obsolescent, it is no longer needed because something better has been invented. ...outmoded, obsolescent equipment. Syn: outdated …   English dictionary

  • obsolescent — noncurrent oncurrent adj. not current or belonging to the present time. Opposite of {current}. [Narrower terms: {back(prenominal), out of date}; {discontinued, out of print(predicate), out of production(predicate), out of use(predicate)};… …   The Collaborative International Dictionary of English

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