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Arbor Day

noun
1.
a day, varying in date but always in the spring, observed in certain states of the U.S. by the planting of trees.
Origin
1870-1875
1870-75, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for Arbor Day

the day set aside for the planting of trees, first celebrated 1872 in Nebraska, the brainchild of U.S. agriculturalist and journalist J. Sterling Morton (1832-1902). From Latin arbor "tree," of unknown origin.

Online Etymology Dictionary, © 2010 Douglas Harper
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7
8
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