The Collaborative International Dictionary of English v.0.48:

Neat \Neat\ (n[=e]t), n. sing. & pl. [AS. ne['a]t; akin to OHG.
   n[=o]z, Icel. naut, Sw. n["o]t, Dan. n["o]d, and to AS.
   ne['o]tan to make use of, G. geniessen, Goth. niutan to have
   a share in, have joy of, Lith. nauda use, profit.] (Zool.)
   Cattle of the genus Bos, as distinguished from horses,
   sheep, and goats; an animal of the genus Bos; as, a neat's
   tongue; a neat's foot. --Chaucer.
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         Wherein the herds[men] were keeping of their neat.
                                                  --Spenser.
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         The steer, the heifer, and the calf
         Are all called neat.                     --Shak.
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         A neat and a sheep of his own.           --Tusser.
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   Neat's-foot, an oil obtained by boiling the feet of neat
      cattle. It is used to render leather soft and pliable.
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The Collaborative International Dictionary of English v.0.48:

Neat \Neat\, a. [See neat, n.]
   Of or pertaining to the genus Bos, or to cattle of that
   genus; as, neat cattle.
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The Collaborative International Dictionary of English v.0.48:

Neat \Neat\, a. [Compar. Neater; superl. Neatest.] [OE.
   nett, F. nett, fr. L. nitidus, fr. nitere to shine. Cf.
   Nitid, Net, a., Natty.]
   1. Free from that which soils, defiles, or disorders; clean;
      cleanly; tidy.
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            If you were to see her, you would wonder what poor
            body it was that was so surprisingly neat and clean.
                                                  --Law.
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   2. Free from what is unbecoming, inappropriate, or tawdry;
      simple and becoming; pleasing with simplicity; tasteful;
      chaste; as, a neat style; a neat dress.
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   3. Free from admixture or adulteration; good of its kind; as,
      neat brandy; to drink one's vodka neat. Hence: (Chem.)
      Pure; undiluted; as, dissolved in neat acetone. "Our old
      wine neat." --Chapman.
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   4. Excellent in character, skill, or performance, etc.; nice;
      finished; adroit; as, a neat design; a neat thief.
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   5. With all deductions or allowances made; net.

   Note: [In this sense usually written net. See Net, a.,
         3.]
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   neat line (Civil Engin.), a line to which work is to be
      built or formed.

   Neat work, work built or formed to neat lines.
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   Syn: Nice; pure; cleanly; tidy; trim; spruce.
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WordNet (r) 3.0 (2006):

neat
    adj 1: clean or organized; "her neat dress"; "a neat room" [syn:
           neat, orderly]
    2: showing care in execution; "neat homework"; "neat
       handwriting"
    3: free from what is tawdry or unbecoming; "a neat style"; "a
       neat set of rules"; "she hated to have her neat plans upset"
       [syn: neat, refined, tasteful]
    4: free from clumsiness; precisely or deftly executed; "he
       landed a clean left on his opponent's cheek"; "a clean
       throw"; "the neat exactness of the surgeon's knife" [syn:
       clean, neat]
    5: very good; "he did a bully job"; "a neat sports car"; "had a
       great time at the party"; "you look simply smashing" [syn:
       bang-up, bully, corking, cracking, dandy, great,
       groovy, keen, neat, nifty, not bad(p), peachy,
       slap-up, swell, smashing]
    6: without water; "took his whiskey neat" [syn: neat,
       straight, full-strength]