The Collaborative International Dictionary of English v.0.48:

Permeate \Per"me*ate\, v. t. [imp. & p. p. Permeated; p. pr. &
   vb. n. Permeating.] [L. permeatus, p. p. of permeare to
   permeate; per + meare to go, pass.]
   1. To pass through the pores or interstices of; to penetrate
      and pass through without causing rupture or displacement;
      -- applied especially to fluids which pass through
      substances of loose texture; as, water permeates sand.
      --Woodward.
      [1913 Webster]

   2. To enter and spread through; to pervade; as, after the
      first setback, the team became permeated with pessimism.
      [1913 Webster]

            God was conceived to be diffused throughout the
            whole world, to permeate and pervade all things.
                                                  --Cudworth.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

permeating \permeating\ permeative \permeative\adj.
   Spreading throughout.

   Syn: permeant.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

permeating
    adj 1: spreading or spread throughout; "armed with permeative
           irony...he punctures affectations"; "the pervasive odor
           of garlic"; "an error is pervasive if it is material to
           more than one conclusion" [syn: permeant, permeating,
           permeative, pervasive]