| motion | 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. "Speaking or mute, all comeliness and grace attends thee, and each word, each motion, forms." (Milton) 2. Power of, or capacity for, motion. "Devoid of sense and motion." (Milton) 3. Direction of movement; course; tendency; as, the motion of the planets is from west to east. "In our proper motion we ascend." (Milton) 4. Change in the relative position of the parts of anything; action of a machine with respect to the relative movement of its parts. "This is the great wheel to which the clock owes its motion." (Dr. H. More) 5. Movement of the mind, desires, or passions; mental act, or impulse to any action; internal activity. "Let a good man obey every good motion rising in his heart, knowing that every such motion proceeds from God." (South) 6. A proposal or suggestion looking to action or progress; especially, a formal proposal made in a deliberative assembly; as, a motion to adjourn. "Yes, I agree, and thank you for your motion." (Shak) 7. 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. 8. Change of pitch in successive sounds, whether in the same part or in groups of parts. "The independent motions of different parts sounding together constitute counterpoint." (Grove) 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. 9. A puppet show or puppet. "What motion's this? the model of Nineveh?" (Beau. & Fl) Motion, in mechanics, may be simple or compound. 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. Center of motion, Harmonic motion, etc. See Center, Harmonic, etc. Motion block, an incessant motion conceived to be attainable by a machine supplying its own motive forces independently of any action from without. Synonym: See Movement. Origin: F, fr. L. Motio, fr. Movere, motum, to move. See Move. Source: Websters Dictionary (01 Mar 1998) |
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| motion perception | The real or apparent movement of objects through the visual field. (12 Dec 1998) |
| motion pictures | The art, technique, or business of producing motion pictures for entertainment, propaganda, or instruction. (12 Dec 1998) |
| motion, range of | The range through which a joint can be moved, usually its range of flexion and extension. Due to an injury, the knee may for example lack 10 degrees of full extension. (12 Dec 1998) |
| motion sickness | <neurology> A disturbance of the inner ear that is caused by repeated motion (for example sea sickness, car sickness). Common symptoms include nausea, vomiting and vertigo. (27 Sep 1997) |
| motion therapy, continuous passive | Movement of a body part initiated and maintained by a mechanical or electrical device to restore normal range of motion to joints, muscles, or tendons after surgery, prosthesis implantation, contracture flexion, or long immobilization. (12 Dec 1998) |
| continuous passive motion | A technique in which a joint, usually the knee, is moved constantly in a mechanical splint to prevent stiffness and to increase the range of motion. (05 Mar 2000) |
| space motion sickness | Disorder characterised by nausea, vomiting, and dizziness, possibly in response to vestibular disorientation or fluid shifts associated with space flight. (12 Dec 1998) |
| time and motion studies | The observation and analysis of movements in a task with an emphasis on the amount of time required to perform the task. (12 Dec 1998) |
| equations of motion | <radiobiology> Set of equations describing the time evolution of the variables which describe the state of a physical system. (09 Oct 1997) |
| excito-motion | <physiology> Motion excited by reflex nerves. See Excito-motory. Source: Websters Dictionary (01 Mar 1998) |