Definition of leaven verb from the Oxford Advanced Learner's Dictionary

 

leaven

 verb
verb
BrE BrE//ˈlevn//
 
; NAmE NAmE//ˈlevn//
 
Verb Forms present simple I / you / we / they leaven
BrE BrE//ˈlevn//
 
; NAmE NAmE//ˈlevn//
 
he / she / it leavens
BrE BrE//ˈlevnz//
 
; NAmE NAmE//ˈlevnz//
 
past simple leavened
BrE BrE//ˈlevnd//
 
; NAmE NAmE//ˈlevnd//
 
past participle leavened
BrE BrE//ˈlevnd//
 
; NAmE NAmE//ˈlevnd//
 
-ing form leavening
BrE BrE//ˈlevnɪŋ//
 
; NAmE NAmE//ˈlevnɪŋ//
 
 
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[often passive] leaven something (with something) (formal) to make something more interesting or cheerful by adding something to it Her speech was leavened with a touch of humour. Word Origin Middle English: from Old French levain, based on Latin levamen ‘relief’ (literally ‘means of raising’), from levare ‘to lift’.
See the Oxford Advanced American Dictionary entry: leaven

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