From WordNet (r) 3.0 (2006) [wn]:
easterly
adv 1: from the east; "the winds blew easterly all night" [ant:
westerly]
adj 1: lying in or toward the east; "the east side of New York";
"eastern cities" [syn: easterly, eastern]
2: from the east; used especially of winds; "an eastern wind";
"the winds are easterly" [syn: easterly, eastern]
n 1: a wind from the east [syn: east wind, easter,
easterly]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Easterly \East"er*ly\, a.
1. Coming from the east; as, it was easterly wind.
[1913 Webster]
2. Situated, directed, or moving toward the east; as, the
easterly side of a lake; an easterly course or voyage.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Easterly \East"er*ly\, adv.
Toward, or in the direction of, the east.
[1913 Webster]