Motion
MOH-shun
/ˈmoʊʃən/
The action or process of moving or being moved.
Refers to any change in position or place over time. It's a fundamental concept in physics.
The story behind the word. The word "motion" comes from the Old French "mocion," which itself derived from the Latin "motio," meaning "a moving, motion." This Latin root "movere" simply means "to move," giving us a direct line from ancient concepts of change in position to our modern scientific term.
Word relationships
- movement: "Movement" is often used interchangeably, but "motion" is more common in scientific and technical contexts.
- locomotion: Specifically refers to movement from one place to another, especially by an animal or vehicle.
- stillness: Lack of any movement.
- rest: A state of not moving.
Commonly confused with
- Movement: "Motion" is often preferred in physics, while "movement" can be broader, referring to a gesture or a general shift.
Word family
- move (verb): To change position.
- motionless (adjective): Not moving; still.
Collocations
- constant motion
- circular motion
- relative motion
- perpetual motion
- laws of motion
Idioms & expressions
- go through the motions
- set in motion
- in motion
Example sentences
- "The Earth's continuous motion around the sun defines our year." Describing a simple physical phenomenon.
- "All bodies continue in their state of rest, or of uniform motion in a right line, unless they are compelled to change that state by forces impressed upon it." From a scientific text. (Isaac Newton, Principia Mathematica)
Memory hook
Imagine a MOUNTAIN in MOTION, slowly shifting over geological time. Mountain Motion
When not to use
Do not use when a more specific term like "velocity" or "acceleration" is required to describe the rate or change of movement.
Fun facts
- The concept of 'perpetual motion' machines, which would run forever without external energy, has fascinated inventors for centuries but violates fundamental laws of physics.
Related words
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