Definitions

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

  • transitive v. To make strong or increase the strength of.
  • intransitive v. To become strong or stronger.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To make strong or stronger; to add strength to; to increase the strength of; to fortify; to reinforce.
  • v. To animate; to give moral strength to; to encourage; to fix in resolution; to hearten.
  • v. To augment; to improve; to intensify.
  • v. To grow strong or stronger.

from the GNU version of the Collaborative International Dictionary of English

  • intransitive v. To grow strong or stronger.
  • transitive v. To make strong or stronger; to add strength to.
  • transitive v. To animate; to encourage; to fix in resolution.

from The Century Dictionary and Cyclopedia

  • To make strong or stronger; add strength to, either physical, legal, or moral; confirm; establish: as, to strengthen a limb; to strengthen an obligation; to strengthen a claim; to strengthen authority.
  • Synonyms To invigorate, fortify, brace, nerve, steel, corroborate, support, heighten.
  • To grow strong or stronger.

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

  • v. gain strength
  • v. give a healthy elasticity to
  • v. make strong or stronger

Etymologies

strength +‎ -en (Wiktionary)

Examples

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