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Definition of Arbor Day from the Oxford Advanced Learner's Dictionary

Arbor Day

 
/ˈɑːbə deɪ/
 
/ˈɑːrbər deɪ/
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  1. a special day in America when people plant trees. Each state chooses its own day, usually in the spring, but some southern states have it in the winter.
buttercup
noun
 
 
From the Topic
Plants and trees
C2
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