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arbor day

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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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Ar·bor Day   (är'bər)   
n.  An unofficial holiday observed in all 50 states of the United States, most often on the last Friday in April, for the public planting of trees.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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