The Collaborative International Dictionary of English v.0.48:

Imagery \Im"age*ry\ ([i^]m"[asl]j*r[y^]; 277), n. [OE. imagerie,
   F. imagerie.]
   1. The work of one who makes images or visible representation
      of objects; imitation work; images in general, or in mass.
      "Painted imagery." --Shak.
      [1913 Webster]

            In those oratories might you see
            Rich carvings, portraitures, and imagery. --Dryden.
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   2. Fig.: Unreal show; imitation; appearance.
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            What can thy imagery of sorrow mean?  --Prior.
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   3. The work of the imagination or fancy; false ideas;
      imaginary phantasms.
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            The imagery of a melancholic fancy.   --Atterbury.
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   4. Rhetorical decoration in writing or speaking; vivid
      descriptions presenting or suggesting images of sensible
      objects; figures in discourse.
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            I wish there may be in this poem any instance of
            good imagery.                         --Dryden.
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WordNet (r) 3.0 (2006):

imagery
    n 1: the ability to form mental images of things or events; "he
         could still hear her in his imagination" [syn:
         imagination, imaging, imagery, mental imagery]

Moby Thesaurus II by Grady Ward, 1.0:

145 Moby Thesaurus words for "imagery":
   Vorstellung, allusion, alphabet, apparition, art, asiaticism,
   blueprint, brainchild, bubble, cameo, catalog, cataloging,
   character, character sketch, charactering, characterization, chart,
   chimera, choreography, concept, conception, conceptualization,
   conventional representation, dance notation, delineation, delirium,
   demonstration, depiction, depictment, description, details, device,
   diagram, drama, drawing, eidetic image, eidolon, envisaging,
   envisioning, euphuism, evocation, exemplification, fancy,
   fantasque, fantasy, fiction, figment, figuration,
   figurative language, figurativeness, figure, figure of speech,
   floridity, flourish, flower, flowery style, graphic account,
   hallucination, hieroglyphic, iconography, ideogram, idle fancy,
   illusion, illustration, image, imagery study, imagination, imaging,
   imagining, imagism, imagistic poetry, impression,
   insubstantial image, invention, itemization, letter,
   lifelike image, limning, logogram, logograph, maggot, make-believe,
   manner of speaking, map, mental image, mental picture,
   mental representation, musical notation, myth, nonliterality,
   nonliteralness, notation, objectification, ornament,
   particularization, phantasm, phantom, photograph, pictogram,
   picture, picturing, picturization, plan, poetic imagery, portrait,
   portraiture, portrayal, prefigurement, presentment, printing,
   profile, projection, purple passage, realization, rendering,
   rendition, representation, romance, schema, score, script,
   sick fancy, sketch, specification, syllabary, symbol, symbolism,
   tablature, thick-coming fancies, trip, trope, turn of expression,
   vapor, vignette, vision, visual image, visualization,
   vivid description, way of speaking, whim, whimsy, wildest dreams,
   word painting, word-painting, writing



Easton's 1897 Bible Dictionary:

Imagery
   only in the phrase "chambers of his imagery" (Ezek. 8:12). (See CHAMBER.)