The Collaborative International Dictionary of English v.0.48:

Right \Right\ (r[imac]t), a. [OE. right, riht, AS. riht; akin to
   D. regt, OS. & OHG. reht, G. recht, Dan. ret, Sw. r[aum]tt,
   Icel. rettr, Goth. ra['i]hts, L. rectus, p. p. of regere to
   guide, rule; cf. Skr. [.r]ju straight, right. [root]115. Cf.
   Adroit,Alert, Correct, Dress, Regular, Rector,
   Recto, Rectum, Regent, Region, Realm, Rich,
   Royal, Rule.]
   1. Straight; direct; not crooked; as, a right line. "Right as
      any line." --Chaucer
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   2. Upright; erect from a base; having an upright axis; not
      oblique; as, right ascension; a right pyramid or cone.
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   3. Conformed to the constitution of man and the will of God,
      or to justice and equity; not deviating from the true and
      just; according with truth and duty; just; true.
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            That which is conformable to the Supreme Rule is
            absolutely right, and is called right simply without
            relation to a special end.            --Whately.
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   2. Fit; suitable; proper; correct; becoming; as, the right
      man in the right place; the right way from London to
      Oxford.
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   5. Characterized by reality or genuineness; real; actual; not
      spurious. "His right wife." --Chaucer.
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            In this battle, . . . the Britons never more plainly
            manifested themselves to be right barbarians.
                                                  --Milton.
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   6. According with truth; passing a true judgment; conforming
      to fact or intent; not mistaken or wrong; not erroneous;
      correct; as, this is the right faith.
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            You are right, Justice, and you weigh this well.
                                                  --Shak.
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            If there be no prospect beyond the grave, the
            inference is . . . right, "Let us eat and drink, for
            to-morrow we die."                    --Locke.
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   7. Most favorable or convenient; fortunate.
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            The lady has been disappointed on the right side.
                                                  --Spectator.
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   8. Of or pertaining to that side of the body in man on which
      the muscular action is usually stronger than on the other
      side; -- opposed to left when used in reference to a part
      of the body; as, the right side, hand, arm. Also applied
      to the corresponding side of the lower animals.
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            Became the sovereign's favorite, his right hand.
                                                  --Longfellow.
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   Note: In designating the banks of a river, right and left are
         used always with reference to the position of one who
         is facing in the direction of the current's flow.
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   9. Well placed, disposed, or adjusted; orderly; well
      regulated; correctly done.
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   10. Designed to be placed or worn outward; as, the right side
       of a piece of cloth.
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   At right angles, so as to form a right angle or right
      angles, as when one line crosses another perpendicularly.


   Right and left, in both or all directions. [Colloq.]

   Right and left coupling (Pipe fitting), a coupling the
      opposite ends of which are tapped for a right-handed screw
      and a left-handed screw, respectivelly.

   Right angle.
       (a) The angle formed by one line meeting another
           perpendicularly, as the angles ABD, DBC.
       (b) (Spherics) A spherical angle included between the
           axes of two great circles whose planes are
           perpendicular to each other.

   Right ascension. See under Ascension.

   Right Center (Politics), those members belonging to the
      Center in a legislative assembly who have sympathies with
      the Right on political questions. See Center, n., 5.

   Right cone, Right cylinder, Right prism, Right
   pyramid (Geom.), a cone, cylinder, prism, or pyramid, the
      axis of which is perpendicular to the base.

   Right line. See under Line.

   Right sailing (Naut.), sailing on one of the four cardinal
      points, so as to alter a ship's latitude or its longitude,
      but not both. --Ham. Nav. Encyc.

   Right sphere (Astron. & Geol.), a sphere in such a position
      that the equator cuts the horizon at right angles; in
      spherical projections, that position of the sphere in
      which the primitive plane coincides with the plane of the
      equator.
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   Note: Right is used elliptically for it is right, what you
         say is right, true.
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               "Right," cries his lordship.       --Pope.
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   Syn: Straight; direct; perpendicular; upright; lawful;
        rightful; true; correct; just; equitable; proper;
        suitable; becoming.
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The Collaborative International Dictionary of English v.0.48:

Angle \An"gle\ ([a^][ng]"g'l), n. [F. angle, L. angulus angle,
   corner; akin to uncus hook, Gr. 'agky`los bent, crooked,
   angular, 'a`gkos a bend or hollow, AS. angel hook, fish-hook,
   G. angel, and F. anchor.]
   1. The inclosed space near the point where two lines meet; a
      corner; a nook.
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            Into the utmost angle of the world.   --Spenser.
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            To search the tenderest angles of the heart.
                                                  --Milton.
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   2. (Geom.)
      (a) The figure made by. two lines which meet.
      (b) The difference of direction of two lines. In the lines
          meet, the point of meeting is the vertex of the angle.
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   3. A projecting or sharp corner; an angular fragment.
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            Though but an angle reached him of the stone.
                                                  --Dryden.
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   4. (Astrol.) A name given to four of the twelve astrological
      "houses." [Obs.] --Chaucer.
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   5. [AS. angel.] A fishhook; tackle for catching fish,
      consisting of a line, hook, and bait, with or without a
      rod.
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            Give me mine angle: we 'll to the river there.
                                                  --Shak.
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            A fisher next his trembling angle bears. --Pope.
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   Acute angle, one less than a right angle, or less than
      90[deg].

   Adjacent or Contiguous angles, such as have one leg
      common to both angles.

   Alternate angles. See Alternate.

   Angle bar.
      (a) (Carp.) An upright bar at the angle where two faces of
          a polygonal or bay window meet. --Knight.
      (b) (Mach.) Same as Angle iron.

   Angle bead (Arch.), a bead worked on or fixed to the angle
      of any architectural work, esp. for protecting an angle of
      a wall.

   Angle brace, Angle tie (Carp.), a brace across an
      interior angle of a wooden frame, forming the hypothenuse
      and securing the two side pieces together. --Knight.

   Angle iron (Mach.), a rolled bar or plate of iron having
      one or more angles, used for forming the corners, or
      connecting or sustaining the sides of an iron structure to
      which it is riveted.

   Angle leaf (Arch.), a detail in the form of a leaf, more or
      less conventionalized, used to decorate and sometimes to
      strengthen an angle.

   Angle meter, an instrument for measuring angles, esp. for
      ascertaining the dip of strata.

   Angle shaft (Arch.), an enriched angle bead, often having a
      capital or base, or both.

   Curvilineal angle, one formed by two curved lines.

   External angles, angles formed by the sides of any
      right-lined figure, when the sides are produced or
      lengthened.

   Facial angle. See under Facial.

   Internal angles, those which are within any right-lined
      figure.

   Mixtilineal angle, one formed by a right line with a curved
      line.

   Oblique angle, one acute or obtuse, in opposition to a
      right angle.

   Obtuse angle, one greater than a right angle, or more than
      90[deg].

   Optic angle. See under Optic.

   Rectilineal or Right-lined angle, one formed by two right
      lines.

   Right angle, one formed by a right line falling on another
      perpendicularly, or an angle of 90[deg] (measured by a
      quarter circle).

   Solid angle, the figure formed by the meeting of three or
      more plane angles at one point.

   Spherical angle, one made by the meeting of two arcs of
      great circles, which mutually cut one another on the
      surface of a globe or sphere.

   Visual angle, the angle formed by two rays of light, or two
      straight lines drawn from the extreme points of an object
      to the center of the eye.

   For Angles of commutation, draught, incidence,
   reflection, refraction, position, repose, fraction,
      see Commutation, Draught, Incidence, Reflection,
      Refraction, etc.
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WordNet (r) 3.0 (2006):

right angle
    n 1: the 90 degree angle between two perpendicular lines [ant:
         oblique angle]