The Collaborative International Dictionary of English v.0.48:

Northeast \North`east"\, n.
   The point between the north and east, at an equal distance
   from each; the northeast part or region.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Northeast \North`east"\, a.
   Of or pertaining to the northeast; proceeding toward the
   northeast, or coming from that point; as, a northeast course;
   a northeast wind.
   [1913 Webster]

   Northeast passage, a passage or communication by sea
      between the Atlantic and Pacific oceans along the north
      coast of Asia.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Northeast \North`east"\, adv.
   Toward the northeast.
   [1913 Webster]

WordNet (r) 3.0 (2006):

northeast
    adv 1: to, toward, or in the northeast [syn: northeast,
           north-east, nor'-east]
    adj 1: situated in or oriented toward the northeast; "the
           northeasterly part of the island" [syn: northeastern,
           northeasterly, northeast]
    2: coming from the northeast; "northeasterly winds" [syn:
       northeasterly, northeast]
    n 1: the compass point midway between north and east; at 45
         degrees [syn: northeast, nor'-east, northeastward,
         NE]
    2: the northeastern region of the United States [syn:
       Northeast, northeastern United States]
    3: the direction corresponding to the northeastward compass
       point
    4: a location in the northeastern part of a country, region, or
       city

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "northeast":
   Dixie, Dixieland, Down East, East, East Coast, Middle Atlantic,
   Middle West, NE by N, NNE, New England, North,
   North Central region, Northeast, Northwest, Pacific Northwest,
   South, Southeast, Southwest, Sunbelt, West, West Coast, Yankeeland,
   antarctic, arctic, austral, boreal, cardinal points, compass card,
   compass rose, degrees, east, eastbound, easterly, eastermost,
   eastern, easternmost, eastland, eastward, half points, hyperborean,
   lubber line, meridional, north, north-northeast, northbound,
   northeast by east, northeast by north, northeasterly, northeastern,
   northeastward, northeastwardly, northeastwards, northerly,
   northern, northernmost, northland, northward, northwest,
   northwesterly, northwestern, occident, occidental, orient,
   oriental, quarter points, rhumb, south, southbound, southeast,
   southeasterly, southeastern, southerly, southern, southernmost,
   southward, southwest, southwesterly, southwestern, sunrise, sunset,
   the Coast, west, westbound, westerly, western, westernmost,
   westland, westward, wild West