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replace

[ri-pleys]
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verb (used with object), re·placed, re·plac·ing.
  1. to assume the former role, position, or function of; substitute for (a person or thing): Electricity has replaced gas in lighting.
  2. to provide a substitute or equivalent in the place of: to replace a broken dish.
  3. to restore; return; make good: to replace a sum of money borrowed.
  4. to restore to a former or the proper place: to replace the vase on the table.
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Origin of replace

First recorded in 1585–95; re- + place
Related formsre·place·a·ble, adjectivere·place·a·bil·i·ty, nounre·plac·er, nounnon·re·place·a·ble, adjectivequa·si-re·placed, adjectiveun·re·place·a·ble, adjectiveun·re·placed, adjectivewell-re·placed, adjective

Synonyms

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1. succeed. Replace, supersede, supplant refer to putting one thing or person in place of another. To replace is to take the place of, to succeed: Ms. Jones will replace Mr. Smith as president. Supersede implies that that which is replacing another is an improvement: The computer has superseded the typewriter. Supplant implies that that which takes the other's place has ousted the former holder and usurped the position or function, especially by art or fraud: to supplant a former favorite. 3. refund, repay.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for non-replaceable

replace

verb (tr)
  1. to take the place of; supersedethe manual worker is being replaced by the machine
  2. to substitute a person or thing for (another which has ceased to fulfil its function); put in place ofto replace an old pair of shoes
  3. to put back or return; restore to its rightful place
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Derived Formsreplaceable, adjectivereplaceability, nounreplacer, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for non-replaceable

replace

v.

1590s, "to restore to a previous place or position," from re- "back, again" + place (v.). Meaning "to take the place of" is recorded from 1753; that of "to fill the place of (with something else)" is from 1765. Related: Replaced; replacing.

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Online Etymology Dictionary, © 2010 Douglas Harper