The Collaborative International Dictionary of English v.0.48:

Realization \Re`al*i*za"tion\ (r[=e]`al*[i^]*z[=a]"sh[u^]n), n.
   [Cf. F. r['e]alisation.]
   The act of realizing, or the state of being realized.
   [1913 Webster]

WordNet (r) 3.0 (2006):

realization
    n 1: coming to understand something clearly and distinctly; "a
         growing realization of the risk involved"; "a sudden
         recognition of the problem he faced"; "increasing
         recognition that diabetes frequently coexists with other
         chronic diseases" [syn: realization, realisation,
         recognition]
    2: making real or giving the appearance of reality [syn:
       realization, realisation, actualization,
       actualisation]
    3: a musical composition that has been completed or enriched by
       someone other than the composer [syn: realization,
       realisation]
    4: a sale in order to obtain money (as a sale of stock or a sale
       of the estate of a bankrupt person) or the money so obtained
       [syn: realization, realisation]
    5: the completion or enrichment of a piece of music left
       sparsely notated by a composer [syn: realization,
       realisation]
    6: something that is made real or concrete; "the victory was the
       realization of a whole year's work" [syn: realization,
       realisation, fruition]

Moby Thesaurus II by Grady Ward, 1.0:

148 Moby Thesaurus words for "realization":
   accident, accomplished fact, accomplishment, achievement,
   actualization, alphabet, apparition, appearance, appearing,
   apperception, appreciation, appreciativeness, apprehension,
   arising, art, attainment, avatar, awareness, blueprint,
   bringing to fruition, carrying out, charactering, characterization,
   chart, choreography, closure, cognition, cognizance, coming,
   coming into being, coming to be, coming-forth, completion,
   comprehension, conception, consciousness, constitution,
   consummation, contingency, contingent, conventional representation,
   culmination, dance notation, delineation, demonstration, depiction,
   depictment, diagram, discharge, disclosure, dispatch,
   distinguishment, doing, drama, drawing, effectuation, emergence,
   epiphany, establishment, event, eventuality, eventuation,
   execution, exemplification, exposure, fait accompli, figuration,
   formation, forthcoming, foundation, fruition, fulfillment,
   hieroglyphic, iconography, identification, ideogram, illustration,
   imagery, imaging, implementation, inauguration, incarnation,
   inception, incidence, insight, installation, institution, issuance,
   letter, limning, logogram, logograph, manifestation, map,
   materialization, materializing, mindfulness, mission accomplished,
   musical notation, noesis, notation, note, notice, occurrence,
   opening, operation, organization, overproduction, perception,
   perfection, performance, pictogram, picturization, plan,
   portraiture, portrayal, prefigurement, presentation, presentment,
   printing, production, productiveness, projection, recognition,
   reidentification, rendering, rendition, representation, revelation,
   rise, rising, schema, score, script, sensibility, setting-up,
   showing, showing forth, success, syllabary, symbol, tablature,
   theophany, topping-off, understanding, unfolding, unfoldment,
   writing



The Free On-line Dictionary of Computing (30 December 2018):

realization

    A UML semantic relationship between a
   classifier that specifies a contract and another classifier
   that guarantees to carry it out.

   [Handout by Mr. David Gillibrand].

   (2007-03-15)