The Collaborative International Dictionary of English v.0.48:

specific \spe*cif"ic\ (sp[-e]*s[i^]f"[i^]k), a. [F.
   sp['e]cifique, or NL. spesificus; L. species a particular
   sort or kind + facere to make. Cf. specify.]
   1. Of or pertaining to a species; characterizing or
      constituting a species; possessing the peculiar property
      or properties of a thing which constitute its species, and
      distinguish it from other things; as, the specific form of
      an animal or a plant; the specific qualities of a drug;
      the specific distinction between virtue and vice.
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            Specific difference is that primary attribute which
            distinguishes each species from one another. --I.
                                                  Watts.
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   2. Specifying; definite, or making definite; limited;
      precise; discriminating; as, a specific statement.
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   3. (Med.) Exerting a peculiar influence over any part of the
      body; preventing or curing disease by a peculiar
      adaptation, and not on general principles; as, quinine is
      a specific medicine in cases of malaria.
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            In fact, all medicines will be found specific in the
            perfection of the science.            --Coleridge.
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   Specific character (Nat. Hist.), a characteristic or
      characteristics distinguishing one species from every
      other species of the same genus.

   Specific disease (Med.)
      (a) A disease which produces a determinate definite effect
          upon the blood and tissues or upon some special
          tissue.
      (b) A disease which is itself uniformly produced by a
          definite and peculiar poison or organism.

   Specific duty. (Com.) See under Duty.

   Specific gravity. (Physics) See under Gravity.

   Specific heat (Physics), the quantity of heat required to
      raise the temperature of a body one degree, taking as the
      unit of measure the quantity required to raise the same
      weight of water from zero to one degree; thus, the
      specific heat of mercury is 0.033, that of water being
      1.000.

   Specific inductive capacity (Physics), the effect of a
      dielectric body in producing static electric induction as
      compared with that of some other body or bodies referred
      to as a standard.

   Specific legacy (Law), a bequest of a particular thing, as
      of a particular animal or piece of furniture, specified
      and distinguished from all others. --Wharton. --Burrill.

   Specific name (Nat. Hist.), the name which, appended to the
      name of the genus, constitutes the distinctive name of the
      species; -- originally applied by Linnaeus to the
      essential character of the species, or the essential
      difference. The present specific name he at first called
      the trivial name.

   Specific performance (Law), the peformance of a contract or
      agreement as decreed by a court of equity.
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The Collaborative International Dictionary of English v.0.48:

Duty \Du"ty\, n.; pl. Duties. [From Due.]
   1. That which is due; payment. [Obs. as signifying a material
      thing.]
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            When thou receivest money for thy labor or ware,
            thou receivest thy duty.              --Tyndale.
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   2. That which a person is bound by moral obligation to do, or
      refrain from doing; that which one ought to do; service
      morally obligatory.
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            Forgetting his duty toward God, his sovereign lord,
            and his country.                      --Hallam.
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   3. Hence, any assigned service or business; as, the duties of
      a policeman, or a soldier; to be on duty.
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            With records sweet of duties done.    --Keble.
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            To employ him on the hardest and most imperative
            duty.                                 --Hallam.
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            Duty is a graver term than obligation. A duty hardly
            exists to do trivial things; but there may be an
            obligation to do them.                --C. J. Smith.
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   4. Specifically, obedience or submission due to parents and
      superiors. --Shak.
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   5. Respect; reverence; regard; act of respect; homage. "My
      duty to you." --Shak.
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   6. (Engin.) The efficiency of an engine, especially a steam
      pumping engine, as measured by work done by a certain
      quantity of fuel; usually, the number of pounds of water
      lifted one foot by one bushel of coal (94 lbs. old
      standard), or by 1 cwt. (112 lbs., England, or 100 lbs.,
      United States).
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   7. (Com.) Tax, toll, impost, or customs; excise; any sum of
      money required by government to be paid on the
      importation, exportation, or consumption of goods.
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   Note: An impost on land or other real estate, and on the
         stock of farmers, is not called a duty, but a direct
         tax. [U.S.]
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   Ad valorem duty, a duty which is graded according to the
      cost, or market value, of the article taxed. See Ad
      valorem.

   Specific duty, a duty of a specific sum assessed on an
      article without reference to its value or market.

   On duty, actually engaged in the performance of one's
      assigned task.
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