Webster's English Dictionary

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fluctuate

Cross references:
  1. swing                 
 
fluc.tu.ate \'fl*k-ch*-.wa-t\ \.fl*k-ch*-'wa--sh*n\ vb [L fluctuatus, pp. 
   of fluctuare, fr. fluctus flow, wave, fr.]fluctus, pp. of fluere 1: to ebb 
   and flow in waves  2: to shift back and forth uncertainly  : to cause to 
   fluctuate  - fluc.tu.a.tion n