moving, directed, or situated toward the west: the westerly end of the field.
(especially of a wind) coming from the west: a westerly gale.
toward the west: to escape westerly.
from the west: a sharp wind blowing westerly.
noun, plural westerlies.
a wind that blows from the west: an occasional westerly that pommeled the island.
westerlies, (used with a plural verb) any semipermanent belt of westerly winds, especially those that prevail at latitudes lying between the tropical and polar regions of the earth.

1570–80; west + -erly, as in easterly

westerliness, noun
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World English Dictionary
Westerlies (ˈwɛstəlɪz)
pl n
meteorol the prevailing winds blowing from the west on the poleward sides of the horse latitudes, often bringing depressions and anticyclones

westerly (ˈwɛstəlɪ)
1.  of, relating to, or situated in the west
adv, —adj
2.  towards or in the direction of the west
3.  (esp of the wind) from the west
n , -lies
4.  a wind blowing from the west

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
westerly   (wěs'tər-lē)  Pronunciation Key 
A wind, especially a prevailing wind, that blows from the west. The prevailing winds in the middle latitudes are westerlies. See illustration at wind.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

westerly definition

See prevailing westerlies.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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