Submitted by Anonymous (not verified) on Thu, 10/26/2017 - 17:01 Lemma: lengthenNgram Count: 1Wordnet ID: 76668Starts with letter: YesIndefinite Article: aGoogle Ngram Count: 641487Sense count: 2Contained in other ngrams: 4Hierarchy: AdjectivePast ParticipleForms: lengtheninglengthensForms Count: 2