The Collaborative International Dictionary of English v.0.48:

Flair \Flair\ (fl[^a]r), n. [OE. flaireodor, fr. OF. & F. flair,
   fr. OF. flairier, F. flairer, to smell, LL. flagrare for L.
   fragrare. See Flagrant.]
   1. Smell; odor. [Obs.]
      [Webster 1913 Suppl.]

   2. Sense of smell; scent; fig., discriminating sense.
      [Webster 1913 Suppl.]

   3. A talent or ability, expecially an intuitive one that
      makes performance of a task appear easy; an intuitive
      appreciation; a knack; as, she has a flair for acting.
      [PJC]

   4. An attractive way of performing a task; style.
      [PJC]

WordNet (r) 3.0 (2006):

flair
    n 1: a natural talent; "he has a flair for mathematics"; "he has
         a genius for interior decorating" [syn: flair, genius]
    2: distinctive and stylish elegance; "he wooed her with the
       confident dash of a cavalry officer" [syn: dash, elan,
       flair, panache, style]
    3: a shape that spreads outward; "the skirt had a wide flare"
       [syn: flare, flair]

Moby Thesaurus II by Grady Ward, 1.0:

157 Moby Thesaurus words for "flair":
   ability, ableness, acuity, acumen, acuteness, adequacy, adroitness,
   an ear for, an eye for, aptitude, aptness, art, artistic skill,
   artistry, arty-craftiness, bent, blazon, braininess, bravura,
   brightness, brilliance, brilliancy, bump, caliber, capability,
   capableness, capacity, capacity for, chic, clear thinking,
   cleverness, competence, critical discernment, daring, dash,
   demonstration, dexterity, discernment, display, dower, dowry,
   dramatics, eclat, efficacy, efficiency, elan, elegance, endowment,
   equipment, esprit, etalage, exhibition, exhibitionism, facility,
   faculty, false front, fanfaronade, feel, felicity, figure, fitness,
   flaunt, flaunting, flourish, forte, genius, genius for, gift,
   gift for, giftedness, gifts, glamor, head, histrionics,
   inclination, innate aptitude, insight, instinct, judgment,
   keen-wittedness, keenness, knack, leaning, long suit, makings,
   manifestation, mental alertness, mercurial mind, metier, mind,
   native cleverness, natural endowment, natural gift, nimble mind,
   nimble-wittedness, nimbleness, nous, oomph, pageant, pageantry,
   panache, parade, parts, penetration, perception, perceptiveness,
   perspicacity, pizzazz, potential, power, powers, proclivity,
   proficiency, propensity, qualification, quick parts,
   quick thinking, quick wit, quick-wittedness, quickness, ready wit,
   savvy, sham, sharp-wittedness, sharpness, show, showing-off, skill,
   smartness, smarts, sparkle, speciality, spectacle, splash, splurge,
   sprightly wit, staginess, strong flair, strong point, style,
   stylishness, sufficiency, susceptibility, talent, talents, taste,
   tendency, the goods, the stuff, theatrics, turn, turn for, vaunt,
   verve, virtu, vitality, what it takes



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

FLAIR

    An early system on the IBM 650.

   [Listed in CACM 2(5):16 (May 1959)].

   (1995-03-17)