The Oxford Thesaurus An A-Z Dictionary of Synonyms - perfectionn.

1) purity, flawlessness, faultlessness, sublimity, superiority, excellence, pre-eminence, transcendence: Though we strive for perfection, we never can achieve it. 2) completion, completeness, achievement, fulfilment, realization, consummation, accomplishment, attainment: The building doesn't reach perfection till the last roof-tile is in place. 3) ideal, paragon, model, archetype, pattern, mould, standard, idealization, essence, quintessence, acme, pinnacle, summit: Machiavelli probably achieved the perfection of political cunning.