lessen What is the Definition of lessen?Verb:decrease in size, extent, or rangemake smallerwear off or die down Other meanings of lessen (synonyms, cognates). ENRU lessen уменьшать Frequently viewed: instant definitiondog definitioncelebrity meaningoctober meaningenvironment meaninghigher meaningapproval definitionmean definitionminimal meaningdefinition of degreetall meaningball meaning A B C D E F G H I J K L M N O P Q R S T U V W X Y Z