The Collaborative International Dictionary of English v.0.48:

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]

The Collaborative International Dictionary of English v.0.48:

Easterly \East"er*ly\, adv.
   Toward, or in the direction of, the east.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "easterly":
   E, Euroclydon, Tehuantepec wind, Tehuantepecer, antarctic, arctic,
   austral, bise, boreal, east, east wind, eastabout, eastbound,
   easter, eastermost, eastern, easternmost, eastward, eastwardly,
   eastwards, gregale, hyperborean, levanter, meridional, mistral,
   north, north wind, northbound, northeast, northeaster,
   northeasterly, northeastern, norther, northerly, northern,
   northernmost, northwest, northwester, northwesterly, northwestern,
   occidental, oriental, south, south wind, southbound, southeast,
   southeaster, southeasterly, southeastern, souther, southerly,
   southerly buster, southern, southernmost, southwest, southwester,
   southwesterly, southwestern, tramontane, west, west wind,
   westbound, wester, westerly, western, westernmost