The Collaborative International Dictionary of English v.0.48:

Blend \Blend\, v. i.
   To mingle; to mix; to unite intimately; to pass or shade
   insensibly into each other, as colors.
   [1913 Webster]

         There is a tone of solemn and sacred feeling that
         blends with our conviviality.            --Irving.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blend \Blend\, n.
   A thorough mixture of one thing with another, as color, tint,
   etc., into another, so that it cannot be known where one ends
   or the other begins.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blend \Blend\, v. t. [AS. blendan, from blind blind. See
   Blind, a.]
   To make blind, literally or figuratively; to dazzle; to
   deceive. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blend \Blend\ (bl[e^]nd), v. t. [imp. & p. p. Blended or
   Blent (bl[e^]nt); p. pr. & vb. n. Blending.] [OE.
   blenden, blanden, AS. blandan to blend, mix; akin to Goth.
   blandan to mix, Icel. blanda, Sw. blanda, Dan. blande, OHG.
   blantan to mis; to unknown origin.]
   1. To mix or mingle together; esp. to mingle, combine, or
      associate so that the separate things mixed, or the line
      of demarcation, can not be distinguished. Hence: To
      confuse; to confound.
      [1913 Webster]

            Blending the grand, the beautiful, the gay.
                                                  --Percival.
      [1913 Webster]

   2. To pollute by mixture or association; to spoil or corrupt;
      to blot; to stain. [Obs.] --Spenser.
      [1913 Webster]

   Syn: To commingle; combine; fuse; merge; amalgamate;
        harmonize.
        [1913 Webster]

WordNet (r) 3.0 (2006):

blend
    n 1: an occurrence of thorough mixing
    2: a new word formed by joining two others and combining their
       meanings; "`smog' is a blend of `smoke' and `fog'"; "`motel'
       is a portmanteau word made by combining `motor' and `hotel'";
       "`brunch' is a well-known portmanteau" [syn: blend,
       portmanteau word, portmanteau]
    3: the act of blending components together thoroughly [syn:
       blend, blending]
    v 1: combine into one; "blend the nuts and raisins together";
         "he blends in with the crowd"; "We don't intermingle much"
         [syn: blend, intermix, immingle, intermingle]
    2: blend or harmonize; "This flavor will blend with those in
       your dish"; "This sofa won't go with the chairs" [syn:
       blend, go, blend in]
    3: mix together different elements; "The colors blend well"
       [syn: blend, flux, mix, conflate, commingle,
       immix, fuse, coalesce, meld, combine, merge]

Moby Thesaurus II by Grady Ward, 1.0:

169 Moby Thesaurus words for "blend":
   Anschluss, accord, add, addition, admix, admixture, affiliation,
   agglomeration, aggregation, agreement, alliance, alloy, amalgam,
   amalgamate, amalgamation, arrange, assimilate, assimilation,
   association, assonate, atone, attune, be harmonious, be in tune,
   bemingle, blending, cabal, cartel, centralization, chime, chord,
   coalesce, coalescence, coalition, combination, combine, combo,
   come together, commingle, commingling, commix, commixture, compose,
   composite, composition, compound, comprise, concoct, concoction,
   confection, confederacy, confederation, congeries, conglomerate,
   conglomeration, conjugation, conjunction, connect, consolidate,
   consolidation, conspiracy, contamination, ecumenism, embodiment,
   embody, emulsify, encompass, encompassment, enosis, ensemble,
   federalization, federation, flux, fuse, fusion, gradate, grade,
   graduate, harmonize, hash, homogenize, hookup, hybrid, hybrid word,
   hybridism, immingle, immix, immixture, include, inclusion,
   incorporate, incorporation, integrate, integration, interblend,
   interfuse, interfusion, interlace, interlard, intermingle,
   intermingling, intermix, intermixture, intertwine, interweave,
   join, jumble, junction, junta, knead, league, lump together,
   macaronic, macaronicism, magma, make one, marriage, meld, melding,
   melodize, melt into one, merge, merger, mingle, mingle-mangle,
   mingling, mix, mix up, mixture, musicalize, orchestrate, package,
   package deal, paste, portmanteau, portmanteau word,
   portmantologism, put together, reembody, roll into one, scramble,
   shade, shade into, shuffle, solidification, solidify,
   sound in tune, sound together, stir up, symphonize, synchronize,
   syncretism, syncretize, syndicate, syndication, syneresis,
   synthesis, synthesize, telescope word, throw together, tie-up,
   toss together, tune, unification, unify, union, unite, wedding,
   work