1. Having periodic vibrations
   "The oscillating motion of the pendulum was hypnotic to watch";
   - oscillatory

1. Move or swing from side to side regularly
   "the needle on the meter was oscillating";
   - vibrate
    
2. Be undecided about something; waver between conflicting positions or courses of action
   "He oscillates between accepting the new position and retirement";
   - hover, vibrate, vacillate, blow hot and cold [informal]

See also: periodic, periodical

Type of: balk, baulk [Brit], hesitate, sway, swing, waffle [N. Amer, informal], waver

Encyclopedia: Oscillating