moving, directed, or situated toward the east: an easterly course.
(especially of a wind) coming from the east: an easterly gale.
toward the east.
from the east.
noun, plural easterlies.
a wind that blows from the east.

1540–50; obsolete easter eastern (see easterling) + -ly

easterliness, noun
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World English Dictionary
easterly (ˈiːstəlɪ)
1.  of, relating to, or situated in the east
adv, —adj
2.  towards or in the direction of the east
3.  from the east: an easterly wind
n , -lies
4.  a wind from the east

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
easterly   (ē'stər-lē)  Pronunciation Key 
A wind, especially a prevailing wind, that blows from the east. The trade winds in tropical regions and the prevailing winds in the polar regions are easterlies. See illustration at wind.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Most of the data points are arrayed in a north-easterly direction.
Her left eye had a tiny streak of green that went off from the pupil in a north-easterly direction.
The easterly trade winds make the hottest summer days comfortable.
But it took them two weeks in head winds, uncharacteristic calms, and easterly gales.
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