Source : Webster's Revised Unabridged Dictionary (1913)

Diffuse \Dif*fuse"\, v. t. [imp. & p. p. {Diffused}; p. pr. &
   vb. n. {Diffusing}.] [L. diffusus, p. p. of diffundere to
   pour out, to diffuse; dif- = dis- + fundere to pour. See
   {Fuse} to melt.]
   To pour out and cause to spread, as a fluid; to cause to flow
   on all sides; to send out, or extend, in all directions; to
   spread; to circulate; to disseminate; to scatter; as to
   diffuse information.

         Thence diffuse His good to worlds and ages infinite.
                                                  --Milton.

         We find this knowledge diffused among all civilized
         nations.                                 --Whewell.

   Syn: To expand; spread; circulate; extend; scatter; disperse;
        publish; proclaim.

Diffuse \Dif*fuse"\, v. i.
   To pass by spreading every way, to diffuse itself.

Diffuse \Dif*fuse"\, a. [L. diffusus, p. p.]
   Poured out; widely spread; not restrained; copious; full;
   esp., of style, opposed to {concise} or {terse}; verbose;
   prolix; as, a diffuse style; a diffuse writer.

         A diffuse and various knowledge of divine and human
         things.                                  --Milton.

   Syn: Prolix; verbose; wide; copious; full. See {Prolix}.

Source : WordNet®

diffuse
     adj 1: spread out; not concentrated in one place; "a large diffuse
            organization"
     2: lacking conciseness; "a diffuse historical novel"

diffuse
     v 1: move outward; "The soldiers fanned out" [syn: {spread}, {spread
          out}, {fan out}]
     2: spread or diffuse through; "An atmosphere of distrust has
        permeated this administration"; "music penetrated the
        entire building" [syn: {permeate}, {pervade}, {penetrate},
         {interpenetrate}, {imbue}]
     3: cause to become widely known; "spread information";
        "circulate a rumor"; "broadcast the news" [syn: {circulate},
         {circularize}, {circularise}, {distribute}, {disseminate},
         {propagate}, {broadcast}, {spread}, {disperse}, {pass
        around}]