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 for Base course
From The Collaborative International Dictionary of English v.0.48 :

  Base \Base\, n. [F. base, L. basis, fr. Gr. ba`sis a stepping,
     step, a base, pedestal, fr. bai`nein to go, step, akin to E.
     come. Cf. Basis, and see Come.]
     1. The bottom of anything, considered as its support, or that
        on which something rests for support; the foundation; as,
        the base of a statue. "The base of mighty mountains."
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     2. Fig.: The fundamental or essential part of a thing; the
        essential principle; a groundwork.
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     3. (Arch.)
        (a) The lower part of a wall, pier, or column, when
            treated as a separate feature, usually in projection,
            or especially ornamented.
        (b) The lower part of a complete architectural design, as
            of a monument; also, the lower part of any elaborate
            piece of furniture or decoration.
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     4. (Bot.) That extremity of a leaf, fruit, etc., at which it
        is attached to its support.
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     5. (Chem.) The positive, or non-acid component of a salt; a
        substance which, combined with an acid, neutralizes the
        latter and forms a salt; -- applied also to the hydroxides
        of the positive elements or radicals, and to certain
        organic bodies resembling them in their property of
        forming salts with acids.
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     6. (Pharmacy) The chief ingredient in a compound.
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     7. (Dyeing) A substance used as a mordant. --Ure.
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     8. (Fort.) The exterior side of the polygon, or that
        imaginary line which connects the salient angles of two
        adjacent bastions.
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     9. (Geom.) The line or surface constituting that part of a
        figure on which it is supposed to stand.
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     10. (Math.) The number from which a mathematical table is
         constructed; as, the base of a system of logarithms.
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     11. [See Base low.] A low, or deep, sound. (Mus.)
         (a) The lowest part; the deepest male voice.
         (b) One who sings, or the instrument which plays, base.
             [Now commonly written bass.]
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                   The trebles squeak for fear, the bases roar.
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     12. (Mil.) A place or tract of country, protected by
         fortifications, or by natural advantages, from which the
         operations of an army proceed, forward movements are
         made, supplies are furnished, etc.
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     13. (Mil.) The smallest kind of cannon. [Obs.]
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     14. (Zool.) That part of an organ by which it is attached to
         another more central organ.
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     15. (Crystallog.) The basal plane of a crystal.
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     16. (Geol.) The ground mass of a rock, especially if not
         distinctly crystalline.
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     17. (Her.) The lower part of the field. See Escutcheon.
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     18. The housing of a horse. [Obs.]
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     19. pl. A kind of skirt (often of velvet or brocade, but
         sometimes of mailed armor) which hung from the middle to
         about the knees, or lower. [Obs.]
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     20. The lower part of a robe or petticoat. [Obs.]
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     21. An apron. [Obs.] "Bakers in their linen bases."
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     22. The point or line from which a start is made; a starting
         place or a goal in various games.
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               To their appointed base they went.   --Dryden.
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     23. (Surv.) A line in a survey which, being accurately
         determined in length and position, serves as the origin
         from which to compute the distances and positions of any
         points or objects connected with it by a system of
         triangles. --Lyman.
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     24. A rustic play; -- called also prisoner's base, prison
         base, or bars. "To run the country base." --Shak.
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     25. (Baseball) Any one of the four bounds which mark the
         circuit of the infield.
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     Altern base. See under Altern.
     Attic base. (Arch.) See under Attic.
     Base course. (Arch.)
         (a) The first or lower course of a foundation wall, made
             of large stones or a mass of concrete; -- called also
             foundation course.
         (b) The architectural member forming the transition
             between the basement and the wall above.
     Base hit (Baseball), a hit, by which the batsman, without
        any error on the part of his opponents, is able to reach
        the first base without being put out.
     Base line.
         (a) A main line taken as a base, as in surveying or in
             military operations.
         (b) A line traced round a cannon at the rear of the vent.
     Base plate, the foundation plate of heavy machinery, as of
        the steam engine; the bed plate.
     Base ring (Ordnance), a projecting band of metal around the
        breech, connected with the body of the gun by a concave
        molding. --H. L. Scott.
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