Definition of foliage noun from the Oxford Advanced Learner's Dictionary

 

foliage

 noun
noun
BrE BrE//ˈfəʊliɪdʒ//
 
; NAmE NAmE//ˈfoʊliɪdʒ//
 
[uncountable]
 
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the leaves of a tree or plant; leaves and branches together dense green foliage Word Origin late Middle English foilage (in the sense ‘design resembling leaves’): from Old French feuillage, from feuille ‘leaf’, from Latin folium. The change in the first syllable was due to association with Latin folium.
See the Oxford Advanced American Dictionary entry: foliage