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2 definitions found
 for Center of motion
From The Collaborative International Dictionary of English v.0.48 :

  Motion \Mo"tion\, n. [F., fr. L. motio, fr. movere, motum, to
     move. See Move.]
     1. The act, process, or state of changing place or position;
        movement; the passing of a body from one place or position
        to another, whether voluntary or involuntary; -- opposed
        to rest.
        [1913 Webster]
              Speaking or mute, all comeliness and grace
              attends thee, and each word, each motion, forms.
        [1913 Webster]
     2. Power of, or capacity for, motion.
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              Devoid of sense and motion.           --Milton.
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     3. Direction of movement; course; tendency; as, the motion of
        the planets is from west to east.
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              In our proper motion we ascend.       --Milton.
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     4. Change in the relative position of the parts of anything;
        action of a machine with respect to the relative movement
        of its parts.
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              This is the great wheel to which the clock owes its
              motion.                               --Dr. H. More.
        [1913 Webster]
     5. Movement of the mind, desires, or passions; mental act, or
        impulse to any action; internal activity.
        [1913 Webster]
              Let a good man obey every good motion rising in his
              heart, knowing that every such motion proceeds from
              God.                                  --South.
        [1913 Webster]
     6. A proposal or suggestion looking to action or progress;
        esp., a formal proposal made in a deliberative assembly;
        as, a motion to adjourn.
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              Yes, I agree, and thank you for your motion. --Shak.
        [1913 Webster]
     7. (Law) An application made to a court or judge orally in
        open court. Its object is to obtain an order or rule
        directing some act to be done in favor of the applicant.
        --Mozley & W.
        [1913 Webster]
     8. (Mus.) Change of pitch in successive sounds, whether in
        the same part or in groups of parts.
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              The independent motions of different parts sounding
              together constitute counterpoint.     --Grove.
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     Note: Conjunct motion is that by single degrees of the scale.
           Contrary motion is that when parts move in opposite
           directions. Disjunct motion is motion by skips. Oblique
           motion is that when one part is stationary while
           another moves. Similar or direct motion is that when
           parts move in the same direction.
           [1913 Webster]
     9. A puppet show or puppet. [Obs.]
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              What motion's this? the model of Nineveh? --Beau. &
        [1913 Webster]
     Note: Motion, in mechanics, may be simple or compound.
     Simple+motions+are:+({a">Simple motions are: ({a) straight translation, which, if
        of indefinite duration, must be reciprocating. ({b)
        Simple rotation, which may be either continuous or
        reciprocating, and when reciprocating is called
        oscillating. ({c) Helical, which, if of indefinite
        duration, must be reciprocating.
     Compound motion consists of combinations of any of the
        simple motions.
        [1913 Webster]
     Center of motion, Harmonic motion, etc. See under
        Center, Harmonic, etc.
     Motion block (Steam Engine), a crosshead.
     Perpetual motion (Mech.), an incessant motion conceived to
        be attainable by a machine supplying its own motive forces
        independently of any action from without. According to the
        law of conservation of energy, such perpetual motion is
        impossible, and no device has yet been built that is
        capable of perpetual motion.
        [1913 Webster +PJC]
     Syn: See Movement.
          [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  center \cen"ter\ (s[e^]n"t[~e]r), n. [F. centre, fr. L. centrum,
     fr. Gr. ke`ntron any sharp point, the point round which a
     circle is described, fr. kentei^n to prick, goad.]
     1. A point equally distant from the extremities of a line,
        figure, or body, or from all parts of the circumference of
        a circle; the middle point or place.
        [1913 Webster]
     2. The middle or central portion of anything.
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     3. A principal or important point of concentration; the
        nucleus around which things are gathered or to which they
        tend; an object of attention, action, or force; as, a
        center of attaction.
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     4. The earth. [Obs.] --Shak.
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     5. Those members of a legislative assembly (as in France) who
        support the existing government. They sit in the middle of
        the legislative chamber, opposite the presiding officer,
        between the conservatives or monarchists, who sit on the
        right of the speaker, and the radicals or advanced
        republicans who occupy the seats on his left, See Right,
        and Left.
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     6. (Arch.) A temporary structure upon which the materials of
        a vault or arch are supported in position until the work
        becomes self-supporting.
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     7. (Mech.)
        (a) One of the two conical steel pins, in a lathe, etc.,
            upon which the work is held, and about which it
        (b) A conical recess, or indentation, in the end of a
            shaft or other work, to receive the point of a center,
            on which the work can turn, as in a lathe.
            [1913 Webster]
     Note: In a lathe the
     live center is in the spindle of the head stock; the
     dead center is on the tail stock.
     Planer centers are stocks carrying centers, when the object
        to be planed must be turned on its axis.
        [1913 Webster]
     Center of an army, the body or troops occupying the place
        in the line between the wings.
     Center of a curve or Center of a surface (Geom.)
        (a) A point such that every line drawn through the point
            and terminated by the curve or surface is bisected at
            the point.
        (b) The fixed point of reference in polar coordinates. See
     Center of curvature of a curve (Geom.), the center of that
        circle which has at any given point of the curve closer
        contact with the curve than has any other circle whatever.
        See Circle.
     Center of a fleet, the division or column between the van
        and rear, or between the weather division and the lee.
     Center of gravity (Mech.), that point of a body about which
        all its parts can be balanced, or which being supported,
        the whole body will remain at rest, though acted upon by
     Center of gyration (Mech.), that point in a rotating body
        at which the whole mass might be concentrated
        (theoretically) without altering the resistance of the
        intertia of the body to angular acceleration or
     Center of inertia (Mech.), the center of gravity of a body
        or system of bodies.
     Center of motion, the point which remains at rest, while
        all the other parts of a body move round it.
     Center of oscillation, the point at which, if the whole
        matter of a suspended body were collected, the time of
        oscillation would be the same as it is in the actual form
        and state of the body.
     Center of percussion, that point in a body moving about a
        fixed axis at which it may strike an obstacle without
        communicating a shock to the axis.
     Center of pressure (Hydros.), that point in a surface
        pressed by a fluid, at which, if a force equal to the
        whole pressure and in the same line be applied in a
        contrary direction, it will balance or counteract the
        whole pressure of the fluid.
        [1913 Webster] Center

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