Definitions

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

  • transitive & intransitive verb To make or become longer.

from The Century Dictionary.

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

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

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

  • verb transitive To make longer, to extend the length of.
  • verb intransitive To become longer.

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

  • verb become long or longer
  • verb make longer

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

length +‎ -en

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Examples

  • The word Lent, however, comes from the Anglo-Saxon word lengthen, which means: Spring.

    The Origins of Easter | myFiveBest 2010

  • That said, as interest rates come down and loan terms lengthen, microfinance loans become economically attractive to a wider range of businesses, and support longer term investments.

    Elisabeth Rhyne: Why are microfinance interest rates so high? 2010

  • Rocky Delgadillo warned the council that the ballot title could provoke a legal challenge and recommended that it use "lengthen" in the title while also saying that "change" was legally sufficient.

    Open Thread for The Weekend 2006

  • As to the peculiar effect of C final in certain particles to "lengthen" the vowel before it, this C is doubtless the remnant of the intensive enclitic CE, and the so-called 'length' is not in the vowel, but in the more forcible utterance of the C.

    The Roman Pronunciation of Latin Why we use it and how to use it Frances Ellen Lord

  • _Producere_ is the correct technical term for 'lengthen'; compare

    The Last Poems of Ovid 43 BC-18? Ovid

  • A great feature under normal conditions, since it will lengthen the life of your boots, but the rubber caps tended to warp and pinch our toes if we dried ours too close to the fire.

    Danner Expedition GTX Hiking Boots 2009

  • The being able to shorten and lengthen the nylon cord allows for more leverage on the dog when heeling.

    The Magic Heeling Stick 2009

  • The being able to shorten and lengthen the nylon cord allows for more leverage on the dog when heeling.

    The Magic Heeling Stick 2009

  • The dress can be shortened to make a blouse or top, and though the sleeves are traditionally short, you could always lengthen the rectangles they're made from.

    What Women Are Saying About Clothing Today 2009

  • There was not enough on the bolt for me, so I added the trim from the lace curtain, to lengthen the sleeves.

    Same Pattern, 2nd Dress 2009

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