Etymology
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easterly

1540s (adj.), 1630s (adv.), from easter (late 14c.), variant of eastern + -ly (1) and (2). As a noun meaning "easterly wind," by 1901. Old English easterlic meant "pertaining to Easter."

updated on July 28, 2014

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Definitions of easterly from WordNet
1
easterly (adj.)
lying in or toward the east;
Synonyms: eastern
easterly (adj.)
from the east; used especially of winds;
the winds are easterly
Synonyms: eastern
2
easterly (n.)
a wind from the east;
Synonyms: east wind / easter
3
easterly (adv.)
from the east;
the winds blew easterly all night
From wordnet.princeton.edu, not affiliated with etymonline.