Arbor Day

Arbor Day

noun
a day, varying in date but always in the spring, observed in certain states of the U.S. by the planting of trees.

Origin:
1870–75, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

Arbor Day
the day set aside for the planting of trees, first celebrated 1872 in Nebraska, the brainchild of J. Sterling Morton. From L. arbor "tree," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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