Arbor Day Definition
noun
An unofficial US holiday observed most often on the last Friday in April, for the public planting of trees.
American Heritage
A tree-planting day observed individually by the states of the U.S., usually in spring.
Webster's New World
pronoun
(US) (Last Friday in April) The national day of observance of the need to protect trees, celebrated by planting a tree.
Wiktionary
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