Submitted by Anonymous (not verified) on Thu, 10/26/2017 - 17:01 Ngram Count: 1Wordnet ID: 23019Starts with letter: YesIndefinite Article: aGoogle Ngram Count: 15170016Sense count: 19Contained in other ngrams: 61Hierarchy: NounVerbForms: challengingchallengedchallengesForms Count: 3