The Collaborative International Dictionary of English v.0.48:

Perfection \Per*fec"tion\, n. [F. perfection, L. perfectio.]
   1. The quality or state of being perfect or complete, so that
      nothing requisite is wanting; entire development;
      consummate culture, skill, or moral excellence; the
      highest attainable state or degree of excellence;
      maturity; as, perfection in an art, in a science, or in a
      system; perfection in form or degree; fruits in
      perfection.
      [1913 Webster]

   2. A quality, endowment, or acquirement completely excellent;
      an ideal faultlessness; especially, the divine attribute
      of complete excellence. --Shak.
      [1913 Webster]

            What tongue can her perfections tell? --Sir P.
                                                  Sidney.
      [1913 Webster]

   To perfection, in the highest degree of excellence;
      perfectly; as, to imitate a model to perfection.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Perfection \Per*fec"tion\, v. t.
   To perfect. [Obs.] --Foote.
   [1913 Webster]

WordNet (r) 3.0 (2006):

perfection
    n 1: the state of being without a flaw or defect [syn:
         perfection, flawlessness, ne plus ultra] [ant:
         imperfection, imperfectness]
    2: an ideal instance; a perfect embodiment of a concept [syn:
       paragon, idol, perfection, beau ideal]
    3: the act of making something perfect

Moby Thesaurus II by Grady Ward, 1.0:

125 Moby Thesaurus words for "perfection":
   absoluteness, accomplishment, accuracy, achievement, acme,
   acme of perfection, aesthetic proportions, archetype, arete,
   attainment, attention to fact, beauties, beautification,
   belle tournure, bodily charm, bodily grace, care for truth, charms,
   climax, close, closure, completeness, completing, completion,
   conclusion, consummation, correctness, culmination, curvaceousness,
   curves, delicacy, development, elaboration, embellishment, end,
   ending, entireness, essence, evolution, exactitude, exactness,
   excellence, excellency, faithfulness, faultlessness, fidelity,
   fineness, finish, finishing, flawlessness, fulfillment,
   full development, good appearance, good effect, good figure,
   good looks, good points, good proportions, good shape,
   gracefulness, gracility, height, highest pitch, ideal,
   idealization, last word, literalism, literality, literalness,
   lovely build, mathematical precision, maturation, maturity,
   meticulousness, model, mould, ne plus ultra, nice body, niceness,
   nicety, paragon, pattern, peak, pink, pink of perfection, pinnacle,
   pneumaticness, preciseness, precision, purity, quality,
   quintessence, realization, refinement, right, rightness, rigidity,
   rigor, rigorousness, ripeness, ripening, rounding off,
   rounding out, seasoning, severity, sexy body, shapeliness,
   standard, strictness, sublimity, subtlety, summit, superiority,
   termination, terminus, textualism, the letter, top, topping off,
   topping-off, transcendence, ultimate, virtue, wholeness, windup



Easton's 1897 Bible Dictionary:

Perfection
   See SANCTIFICATION.


The Devil's Dictionary (1881-1906):

PERFECTION, n.  An imaginary state of quality distinguished from the
actual by an element known as excellence; an attribute of the critic.
    The editor of an English magazine having received a letter
pointing out the erroneous nature of his views and style, and signed
"Perfection," promptly wrote at the foot of the letter:  "I don't
agree with you," and mailed it to Matthew Arnold.