lighten Pronunciation: /ˈlaɪtn/Translate lighten | into German | into Italian | into Spanish French translation of lightenA. vtr éclaircir [colour, hair, skin]; détendre [atmosphere]B. vi [sky, hair] s'éclaircir; [atmosphere] se détendrelighten in other Oxford dictionaries Definition of lighten in the British & World English dictionary Definition of lighten in the US English dictionary