ADVERB (4)

1. at or on or to the masthead or upper rigging of a ship;
- Example: "climbed aloft to unfurl the sail"

2. upward;
- Example: "the good news sent her spirits aloft"

3. at or to great height; high up in or into the air;
- Example: "eagles were soaring aloft"
- Example: "dust is whirled aloft"

4. in the higher atmosphere above the earth;
- Example: "weather conditions aloft are fine"

The Collaborative International Dictionary of English v.0.48:

Aloft \A*loft"\ (?; 115), adv. [Pref. a- + loft, which properly
   meant air. See Loft.]
   1. On high; in the air; high above the ground. "He steers his
      flight aloft." --Milton.
      [1913 Webster]

   2. (Naut.) In the top; at the mast head, or on the higher
      yards or rigging; overhead; hence (Fig. and Colloq.), in
      or to heaven.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Aloft \A*loft"\, prep.
   Above; on top of. [Obs.]
   [1913 Webster]

         Fresh waters run aloft the sea.          --Holland.
   [1913 Webster]

WordNet (r) 3.0 (2006):

aloft
    adv 1: at or on or to the masthead or upper rigging of a ship;
           "climbed aloft to unfurl the sail"
    2: upward; "the good news sent her spirits aloft"
    3: at or to great height; high up in or into the air; "eagles
       were soaring aloft"; "dust is whirled aloft"
    4: in the higher atmosphere above the earth; "weather conditions
       aloft are fine"