Source : Webster's Revised Unabridged Dictionary (1913)

Onerate \On"er*ate\, v. t. [imp. & p. p. {Onerated}; p. pr. &
   vb. n. {Onerating}.] [L. oneratus, p. p. pf onerare.]
   To load; to burden. [Obs.] --Becon.