The Collaborative International Dictionary of English v.0.48:

Hover \Hov"er\, n. [Etymol. doubtful.]
   A cover; a shelter; a protection. [Archaic] --Carew. --C.
   Kingsley.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hover \Hov"er\, v. i. [imp. & p. p. Hovered; p. pr. & vb. n.
   Hovering.] [OE. hoveren, and hoven, prob. orig., to abide,
   linger, and fr. AS. hof house; cf. OFries. hovia to receive
   into one's house. See Hovel.]
   1. To hang fluttering in the air, or on the wing; to remain
      in flight or floating about or over a place or object; to
      be suspended in the air above something.
      [1913 Webster]

            Great flights of birds are hovering about the
            bridge, and settling on it.           --Addison.
      [1913 Webster]

            A hovering mist came swimming o'er his sight.
                                                  --Dryden.
      [1913 Webster]

   2. To hang about; to move to and fro near a place,
      threateningly, watchfully, or irresolutely.
      [1913 Webster]

            Agricola having sent his navy to hover on the coast.
                                                  --Milton.
      [1913 Webster]

            Hovering o'er the paper with her quill. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hover
    v 1: be undecided about something; waver between conflicting
         positions or courses of action; "He oscillates between
         accepting the new position and retirement" [syn: hover,
         vibrate, vacillate, oscillate]
    2: move to and fro; "The shy student lingered in the corner"
       [syn: hover, linger]
    3: hang in the air; fly or be suspended above
    4: be suspended in the air, as if in defiance of gravity; "The
       guru claimed that he could levitate" [syn: levitate,
       hover]
    5: hang over, as of something threatening, dark, or menacing;
       "The terrible vision brooded over her all day long" [syn:
       brood, hover, loom, bulk large]

Moby Thesaurus II by Grady Ward, 1.0:

114 Moby Thesaurus words for "hover":
   aeroplane, airlift, airplane, approach, around, ascend, aspire,
   await, back down, balance, balloon, be airborne, be imminent,
   be in store, become airborne, brew, clasp, claw skyward, cling to,
   come on, confront, cruise, dance, debate, deliberate, demur,
   draw near, draw nigh, draw on, drift, face, falter, fear, ferry,
   flicker, flit, flitter, float, flutter, fly, fly aloft,
   follow close upon, forthcome, gain altitude, gather, glide,
   go with, hang, hang about, hang around, hang back, hang over,
   hem and haw, hesitate, hop, hover over, huddle, hug, hug the shore,
   hum and haw, hydroplane, impend, jet, jib, keep close to, kite,
   leave the ground, levitate, lie by, lie over, linger, loiter, loom,
   lower, march with, menace, navigate, near, overhang, pause, plane,
   poise, ponder, pull back, retreat, rise, sail, sailplane, scruple,
   seaplane, shilly-shally, shy, soar, spire, stand by, stay inshore,
   stay near, stick at, stickle, stop to consider, straddle the fence,
   strain at, tailgate, take off, take the air, take wing,
   think twice about, threaten, volplane, wait, wing, withdraw, yield,
   zoom