The Collaborative International Dictionary of English v.0.48:

Skill \Skill\, n. [Icel. skil a distinction, discernment; akin
   to skilja to separate, divide, distinguish, Sw. skilja,.
   skille to separate, skiel reason, right, justice, Sw.
   sk[aum]l reason, Lith. skelli to cleave. Cf. Shell,
   Shoal, a multitude.]
   1. Discrimination; judgment; propriety; reason; cause. [Obs.]
      --Shak. "As it was skill and right." --Chaucer.
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            For great skill is, he prove that he wrought. [For
      with good reason he should test what he created.]
                                                  --Chaucer.
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   2. Knowledge; understanding. [Obsoles.]
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            That by his fellowship he color might
            Both his estate and love from skill of any wight.
                                                  --Spenser.
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            Nor want we skill or art.             --Milton.
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   3. The familiar knowledge of any art or science, united with
      readiness and dexterity in execution or performance, or in
      the application of the art or science to practical
      purposes; power to discern and execute; ability to
      perceive and perform; expertness; aptitude; as, the skill
      of a mathematician, physician, surgeon, mechanic, etc.
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            Phocion, . . . by his great wisdom and skill at
            negotiations, diverted Alexander from the conquest
            of Athens.                            --Swift.
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            Where patience her sweet skill imparts. --Keble.
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   4. Display of art; exercise of ability; contrivance; address.
      [Obs.]
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            Richard . . . by a thousand princely skills,
            gathering so much corn as if he meant not to return.
                                                  --Fuller.
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   5. Any particular art. [Obs.]
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            Learned in one skill, and in another kind of
            learning unskillful.                  --Hooker.
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   Syn: Dexterity; adroitness; expertness; art; aptitude;
        ability.

   Usage: Skill, Dexterity, Adroitness. Skill is more
          intelligent, denoting familiar knowledge united to
          readiness of performance. Dexterity, when applied to
          the body, is more mechanical, and refers to habitual
          ease of execution. Adroitness involves the same image
          with dexterity, and differs from it as implaying a
          general facility of movement (especially in avoidance
          of danger or in escaping from a difficalty). The same
          distinctions apply to the figurative sense of the
          words. A man is skillful in any employment when he
          understands both its theory and its practice. He is
          dexterous when he maneuvers with great lightness. He
          is adroit in the use od quick, sudden, and
          well-directed movements of the body or the mind, so as
          to effect the object he has in view.
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The Collaborative International Dictionary of English v.0.48:

Skill \Skill\, v. t.
   To know; to understand. [Obs.]
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         To skill the arts of expressing our mind. --Barrow.
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The Collaborative International Dictionary of English v.0.48:

Skill \Skill\, v. i.
   1. To be knowing; to have understanding; to be dexterous in
      performance. [Obs.]
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            I can not skill of these thy ways.    --Herbert.
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   2. To make a difference; to signify; to matter; -- used
      impersonally. --Spenser.
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            What skills it, if a bag of stones or gold
            About thy neck do drown thee?         --Herbert.
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            It skills not talking of it.          --Sir W.
                                                  Scott.
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WordNet (r) 3.0 (2006):

skill
    n 1: an ability that has been acquired by training [syn:
         skill, accomplishment, acquirement, acquisition,
         attainment]
    2: ability to produce solutions in some problem domain; "the
       skill of a well-trained boxer"; "the sweet science of
       pugilism" [syn: skill, science]

Moby Thesaurus II by Grady Ward, 1.0:

104 Moby Thesaurus words for "skill":
   Mnemosyne, ability, accomplishment, adeptness, adroitness,
   affect memory, anterograde memory, aptitude, art, artistry,
   ascendancy, atavism, capability, cleverness, collective memory,
   command, computer memory, craft, cunning, deanship, deftness,
   dexterity, dexterousness, disk memory, drum memory, ease,
   emotional response, engram, excellence, experience, expertise,
   expertism, expertness, facility, faculty, favor, finesse, forte,
   gift, greatness, handiness, incomparability, information storage,
   ingenuity, inimitability, kinesthetic memory, knack, know-how,
   lead, majority, mastership, mastery, mechanics, mechanism, memory,
   memory bank, memory circuit, memory trace, method, mind, mneme,
   one-upmanship, precedence, predominance, predomination,
   preeminence, preponderance, prepotence, prepotency, prerogative,
   prestige, priority, privilege, proficiency, prowess, quickness,
   race memory, readiness, recollection, remembrance, right-of-way,
   science, screen memory, seniority, skillfulness, sleight, souvenir,
   strength, success, superiority, talent, tape memory, technic,
   technical know-how, technical knowledge, technical skill, technics,
   technique, technology, transcendence, transcendency,
   verbal response, virtuosity, visual memory



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

Skill

   A somewhat peculiar blend between Franz-Lisp and C, with a
   large set of various CAD primitives.  It is owned by
   Cadence Design Systems and has been used in their CAD
   frameworks since 1985.  It's an extension language to the
   CAD framework (in the same way that Emacs-Lisp extends GNU
   Emacs), enabling you to automate virtually everything that
   you can do manually in for example the graphic editor.  Skill
   accepts C-syntax, fun(a b), as well as Lisp syntax, (fun a
   b), but most users (including Cadence themselves) use the
   C-style.

   [Jonas Jarnestrom ].

   (1995-02-14)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

SKILL, contracts. The art of doing a thing as it ought to be done.
     2. Every person who purports to have skill in la business, and
undertakes for hire to perform it, is bound to do it with ordinary skill,
and is responsible civilly in damages for the want of it; 11 M. & W. 483;
and sometimes he is responsible criminally. Vide Mala Praxis; 2 Russ. on Cr.
288,
     3. The degree of skill and diligence required, rises in proportion to
the value of the article, and the delicacy of the operation: more skill is
required, for example, to repair a very delicate mathematical instrument,
than upon a common instrument. Jones' Bailm. 91; 2 Kent, Com. 458, 463; 1
Bell's Com. 459; 2 Ld. Raym. 909, 918; Domat, liv. 1, t. 4, Sec. 8, n. 1;
Poth. Louage, n. 425; Pardess. n. 528; Ayl. Pand. B. 4, t. 7, p. 466; Ersk.
Inst. B. 3, t. 3, Sec. 16; 1 Rolle, Ab. 10; Story's Bailm. Sec. 431, et
seq.; 2 Greenl. Ev. Sec. 144.