(transitive) To make longer, to extend the length of. / (intransitive) To become longer.

Third-person singular simple present indicative form of lengthen

simple past tense and past participle of lengthen

The process of making or growing longer. / (phonology) a type of sound change when a sound (especially a vowel) lengthens

present participle of lengthen

plural of lengthening

plural of lengthener

A person or thing that lengthens something

That may be lengthened.

(phonology) To lengthen (a vowel) upon dropping the consonant that had followed it; to cause to undergo compensatory lengthening.