WordWeb Online

1. Lasting for a markedly brief time
   "a fleeting glance";
   - fugitive, momentaneous, momentary

1. Move along rapidly and lightly; skim or dart
   "The hummingbird fleeted among the branches";
   - flit, flutter, dart
    
2. Disappear gradually
   - evanesce, fade, blow over, pass off, pass

See also: short

Type of: belt along, bucket along, cannonball along, disappear, go away, hasten, hie [archaic], hotfoot, hurry, pelt along, race, rush, rush along, speed, step on it, travel rapidly, vanish, zip

Encyclopedia: Fleeting