Webster's English Dictionary

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oscillate

Cross references:
  1. swing                 
 
os.cil.late \'a:s-*-.la-t\ \a:-'sil-*-.to-r-e-, -.to.r-\ vi [L oscillatus, 
   pp. of oscillare to swing, fr. oscillum swing] 1a: to swing backward and 
   forward like a pendulum : VIBRATE  1b: to move or travel back and forth 
   between two points  2: to vary between opposing beliefs, feelings, or 
   theories : FLUCTUAT E 3: to vary above and below a mean value  - 
   os.cil.la.to.ry aj