The Collaborative International Dictionary
Trifluctuation
Trifluctuation \Tri*fluc`tu*a"tion\, n. [Pref. tri- +
fluctuation.]
A concurrence of three waves. [Obs.] ``A trifluctuation of
evils.''
--Sir T. Browne.
Wiktionary
trifluctuation
n. (context nonce obsolete English) A concurrence of three waves.