[fluc.tu.ate] vb -at.ed ; -at.ing [L fluctuatus, pp. of fluctuare, fr. fluctus flow, wave, fr. fluere--more at fluid] vi (1634) 1: to shift back and forth uncertainly
2: to ebb and flow in waves ~ vt: to cause to fluctuate syn see swing -- fluc.tu.a.tion n -- fluc.tu.a.tion.al adj