proficiency

proficiency
    n 1: the quality of having great facility and competence
    2: skillfulness in the command of fundamentals deriving from
       practice and familiarity; "practice greatly improves
       proficiency" [syn: {proficiency}, {technique}]
    

Proficience \Pro*fi"cience\, Proficiency \Pro*fi"cien*cy\, n.
   The quality of state of being proficient; advance in the
   acquisition of any art, science, or knowledge; progression in
   knowledge; improvement; adeptness; as, to acquire proficiency
   in music.
   [1913 Webster]
    

112 Moby Thesaurus words for "proficiency":
      ability, ableness, address, adeptness, adequacy, adroitness,
      advancement, airmanship, all-knowingness, anabasis, aptitude,
      artfulness, artisanship, artistry, bravura, brilliance, caliber,
      capability, capableness, capacity, cleverness, command, competence,
      competency, condition, control, coordination, craft, craftsmanship,
      cross-disciplinary knowledge, cunning, deep knowledge, deftness,
      dexterity, dexterousness, dextrousness, diplomacy, efficacy,
      efficiency, encyclopedic knowledge, expertise, expertness,
      extensive knowledge, facility, faculty, finesse, fitness,
      fittedness, flair, general knowledge, genius, grace, grip,
      handiness, headway, horsemanship, ingeniousness, ingenuity, knack,
      know-how, march, marksmanship, mastership, mastery, maturity,
      omniscience, ongoing, pansophy, polyhistory, polymathy,
      practical ability, preparedness, profound knowledge, progress,
      prowess, qualification, quickness, readiness, resource,
      resourcefulness, ripeness, savoir faire, savoir-faire, savvy,
      seamanship, seasoning, skill, skillfulness, special knowledge,
      style, sufficiency, suitability, suitableness, suitedness,
      susceptibility, tact, tactfulness, talent, technical brilliance,
      technical mastery, technical skill, technique, tempering,
      the goods, the stuff, timing, trim, virtuosity, what it takes, wit,
      wizardry, workmanship