We found 27 dictionaries that define the word lengthen:

General (24 matching dictionaries)

1. lengthen: Longman Dictionary of Contemporary English
2. lengthen: Merriam-Webster
3. lengthen: Oxford Learner's Dictionaries
4. lengthen: American Heritage Dictionary of the English Language
5. lengthen: Collins English Dictionary
6. lengthen: Vocabulary.com
7. Lengthen, lengthen: Wordnik
8. lengthen: Cambridge Advanced Learner's Dictionary
9. lengthen: Wiktionary
10. lengthen: Webster's New World College Dictionary, 4th Ed.
11. lengthen: The Wordsmyth English Dictionary-Thesaurus
12. lengthen: Infoplease Dictionary
13. Lengthen, lengthen: Dictionary.com
14. lengthen: Cambridge Essential American English Dictionary
15. Lengthen: Online Plain Text English Dictionary
16. lengthen: Webster's Revised Unabridged, 1913 Edition
17. lengthen: Rhymezone
18. Lengthen: AllWords.com Multi-Lingual Dictionary
19. lengthen: Webster's 1828 Dictionary
20. lengthen: FreeDictionary.org
21. lengthen: Mnemonic Dictionary
22. lengthen: TheFreeDictionary.com

Business (1 matching dictionary)

23. lengthen: Legal dictionary

Medicine (1 matching dictionary)

24. lengthen: Medical dictionary

Miscellaneous (1 matching dictionary)

25. lengthen: Idioms

(Note: See lengthened as well.)

Definitions from Wiktionary ( ) ▸ verb:  (transitive) To make longer, to extend the length of. ▸ verb:  (intransitive) To become longer. Similar: increasing, prolongation, protraction, perpetuation, enlengthen, elong, prolong, elongate, prolongate, extend, more... Opposite: shorten, reduce, decrease, truncate Types: stretch, extend, prolong, more... Phrases: lengthen out, lengthen in time, water lengthen, to lengthen the beginning of something, more... Adjectives: long, little, short, opposite, more, lowest ▸ Words similar to lengthen ▸ Usage examples for lengthen ▸ Idioms related to lengthen ▸ Wikipedia articles (New!) ▸ Words that often appear near lengthen ▸ Rhymes of lengthen ▸ Invented words related to lengthen