Definitions

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

  • transitive v. To make or become longer.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To make longer, to extend the length of.
  • v. To become longer.

from the GNU version of the Collaborative International Dictionary of English

  • intransitive v. To become longer.
  • transitive v. To extent in length; to make longer in extent or duration

from The Century Dictionary and Cyclopedia

  • To make long or longer; extend or elongate in space or in duration; protract or prolong: as, to lengthen a line; to lengthen life; to lengthen a vowel or syllable in pronunciation.
  • To grow long or longer; extend in length.

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

  • v. become long or longer
  • v. make longer

Etymologies

length +‎ -en (Wiktionary)

Examples

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