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Arbor Day

a day, varying in date but always in the spring, observed in certain states of the U.S. by the planting of trees.
Origin of Arbor Day
An Americanism dating back to 1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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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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