Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • intransitive verb To repeat over and again; redouble.
  • intransitive verb To double (the initial syllable or all of a root word) to produce an inflectional or derivational form.
  • intransitive verb To form (a new word) by doubling all or part of a word.
  • intransitive verb To be doubled.
  • adjective Doubled.

from The Century Dictionary.

  • To double again; multiply; repeat.
  • In philology, to repeat, as a syllable or the initial part of a syllable (usually a root-syllable). See reduplication.
  • In philology, to be doubled or repeated; undergo reduplication: as, reduplicating verbs.
  • Redoubled; repeated; reduplicative.
  • In botany:
  • Valvate, with the edges folded back so as to project outward: said of petals and sepals in one form of estivation.
  • Describing an estivation so characterized. Also reduplicative.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Double; doubled; reduplicative; repeated.
  • adjective (Bot.) Valvate with the margins curved outwardly; -- said of the �stivation of certain flowers.
  • transitive verb To redouble; to multiply; to repeat.
  • transitive verb (Gram.) To repeat the first letter or letters of (a word). See Reduplication, 3.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective doubled
  • verb linguistics To repeat a word or section of a word in order to form a new word or phrase, possibly with modification of one of the repetitions.

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

  • verb form by reduplication
  • verb make or do or perform again

Etymologies

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

[Late Latin reduplicāre, reduplicāt- : Latin re-, re- + Latin duplicāre, to duplicate; see duplicate.]

Examples

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