From The Collaborative International Dictionary of English v.0.48:

Parallel \Par"al*lel\, a. [F. parall[`e]le, L. parallelus, fr.
   Gr. ?; para` beside + ? of one another, fr. ? other, akin to
   L. alius. See Alien.]
   1. (Geom.) Extended in the same direction, and in all parts
      equally distant; as, parallel lines; parallel planes.
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            Revolutions . . . parallel to the equinoctial.
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   Note: Curved lines or curved planes are said to be parallel
         when they are in all parts equally distant.
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   2. Having the same direction or tendency; running side by
      side; being in accordance (with); tending to the same
      result; -- used with to and with.
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            When honor runs parallel with the laws of God and
            our country, it can not be too much cherished.
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   3. Continuing a resemblance through many particulars;
      applicable in all essential parts; like; similar; as, a
      parallel case; a parallel passage. --Addison.
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   Parallel bar.
      (a) (Steam Eng.) A rod in a parallel motion which is
          parallel with the working beam.
      (b) One of a pair of bars raised about five feet above the
          floor or ground, and parallel to each other, -- used
          for gymnastic exercises.

   Parallel circles of a sphere, those circles of the sphere
      whose planes are parallel to each other.

   Parallel columns, or Parallels (Printing), two or more
      passages of reading matter printed side by side, for the
      purpose of emphasizing the similarity or discrepancy
      between them.

   Parallel forces (Mech.), forces which act in directions
      parallel to each other.

   Parallel motion.
      (a) (Mach.) A jointed system of links, rods, or bars, by
          which the motion of a reciprocating piece, as a piston
          rod, may be guided, either approximately or exactly in
          a straight line. --Rankine.
      (b) (Mus.) The ascending or descending of two or more
          parts at fixed intervals, as thirds or sixths.

   Parallel rod (Locomotive Eng.), a metal rod that connects
      the crank pins of two or more driving wheels; -- called
      also couping rod, in distinction from the connecting
      rod. See Illust. of Locomotive, in App. -- {Parallel
   ruler}, an instrument for drawing parallel lines, so
      constructed as to have the successive positions of the
      ruling edge parallel to each other; also, one consisting
      of two movable parts, the opposite edges of which are
      always parallel.

   Parallel sailing (Naut.), sailing on a parallel of

   Parallel sphere (Astron. & Geog.), that position of the
      sphere in which the circles of daily motion are parallel
      to the horizon, as to an observer at either pole.

   Parallel vise, a vise having jaws so guided as to remain
      parallel in all positions.
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From The Collaborative International Dictionary of English v.0.48:

Parallel \Par"al*lel\, n.
   1. A line which, throughout its whole extent, is equidistant
      from another line; a parallel line, a parallel plane, etc.
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            Who made the spider parallels design,
            Sure as De Moivre, without rule or line ? --Pope.
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   2. Direction conformable to that of another line,
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            Lines that from their parallel decline. --Garth.
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   3. Conformity continued through many particulars or in all
      essential points; resemblance; similarity.
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            Twixt earthly females and the moon
            All parallels exactly run.            --Swift.
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   4. A comparison made; elaborate tracing of similarity; as,
      Johnson's parallel between Dryden and Pope.
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   5. Anything equal to, or resembling, another in all essential
      particulars; a counterpart.
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            None but thyself can be thy parallel. --Pope.
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   6. (Geog.) One of the imaginary circles on the surface of the
      earth, parallel to the equator, marking the latitude;
      also, the corresponding line on a globe or map; as, the
      counry was divided into North and South at the 38th
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   7. (Mil.) One of a series of long trenches constructed before
      a besieged fortress, by the besieging force, as a cover
      for troops supporting the attacking batteries. They are
      roughly parallel to the line of outer defenses of the
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   8. (Print.) A character consisting of two parallel vertical
      lines (thus, ) used in the text to direct attention to a
      similarly marked note in the margin or at the foot of a
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   9. (Elec.) That arrangement of an electrical system in which
      all positive poles, electrodes, terminals, etc., are
      joined to one conductor, and all negative poles, etc., to
      another conductor; -- called also multiple. Opposed to

   Note: Parts of a system so arranged are said to be

   in parallel or

   in multiple.
      [Webster 1913 Suppl.]

   Limiting parallels. See under Limit, v. t.

   Parallel of altitude (Astron.), one of the small circles of
      the sphere, parallel to the horizon; an almucantar.

   Parallel of declination (Astron.), one of the small circles
      of the sphere, parallel to the equator.

   Parallel of latitude.
      (a) (Geog.) See def. 6. above.
      (b) (Astron.) One of the small circles of the sphere,
          parallel to the ecliptic.
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From The Collaborative International Dictionary of English v.0.48:

Parallel \Par"al*lel\, v. t. [imp. & p. p. Paralleled; p. pr.
   & vb. n. Paralleling.]
   1. To place or set so as to be parallel; to place so as to be
      parallel to, or to conform in direction with, something
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            The needle . . . doth parallel and place itself upon
            the true meridian.                    --Sir T.
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   2. Fig.: To make to conform to something else in character,
      motive, aim, or the like.
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            His life is paralleled
            Even with the stroke and line of his great justice.
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   3. To equal; to match; to correspond to. --Shak.
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   4. To produce or adduce as a parallel. [R.] --Locke.
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            My young remembrance can not parallel
            A fellow to it.                       --Shak.
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From The Collaborative International Dictionary of English v.0.48:

Parallel \Par"al*lel\, v. i.
   To be parallel; to correspond; to be like. [Obs.] --Bacon.
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