The Collaborative International Dictionary of English v.0.48:

Percolate \Per"co*late\, v. t. [imp. & p. p. Percolated; p.
   pr. & vb. n. Percolating.] [L. percolatus, p. p. of
   percolare to percolate; per through + colare to strain.]
   To cause to pass through fine interstices, as a liquor; to
   filter; to strain. --Sir M. Hale.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Percolate \Per"co*late\, v. i.
   To pass through fine interstices; to filter; as, water
   percolates through porous stone.
   [1913 Webster]

WordNet (r) 3.0 (2006):

percolate
    n 1: the product of percolation
    v 1: permeate or penetrate gradually; "the fertilizer leached
         into the ground" [syn: leach, percolate]
    2: spread gradually; "Light percolated into our house in the
       morning"
    3: prepare in a percolator; "percolate coffee"
    4: cause (a solvent) to pass through a permeable substance in
       order to extract a soluble constituent
    5: pass through; "Water permeates sand easily" [syn:
       percolate, sink in, permeate, filter]
    6: gain or regain energy; "I picked up after a nap" [syn: perk
       up, perk, percolate, pick up, gain vigor]

Moby Thesaurus II by Grady Ward, 1.0:

150 Moby Thesaurus words for "percolate":
   absorb, act, adsorb, assimilate, bathe, be effective, be in action,
   bleed, blot, blot up, bolt, brew, charge, chemisorb, chemosorb,
   clarify, clear, colliquate, condense, cut, decoagulate, decoct,
   decrassify, deliquesce, depurate, digest, discharge, dissolve,
   distill, douche, drain, drench, dribble, drink, drink in, drink up,
   drip, dripple, drop, drouk, edulcorate, effuse, elute, emit,
   engross, essentialize, excrete, exfiltrate, extract, extravasate,
   exudate, exude, filter, filter in, filtrate, fluidify, fluidize,
   flush, flux, function, fuse, give off, go, gurgle, have effect,
   have free play, have play, hold in solution, imbibe, imbrue, imbue,
   impregnate, infiltrate, infuse, ingest, inject, interpenetrate,
   lave, leach, leak in, liquefy, liquesce, liquidize, lixiviate,
   macerate, melt, melt down, militate, ooze, operate, osmose,
   penetrate, percolate in, percolate into, perform, perk, permeate,
   pervade, play, purify, rectify, reek, refine, rinse, run, saturate,
   screen, seep, seep in, seethe, separate, sieve, sift, slurp up,
   soak, soak in, soak up, sodden, solubilize, solve, sop, sorb,
   souse, spiritualize, sponge, spurtle, steep, strain, sublimate,
   sublime, suffuse, sweat, swill up, take effect, take in, take up,
   thaw, thin, tick, transfuse, transpire, transude, trickle, try,
   unclot, wash, waterlog, weep, winnow, work