Definition

1. Noun:
   • The act of rotating as if on an axis: "rotary motion" refers to the movement of an object turning or spinning around a central point or line.

Usage

• "Rotary motion" is a technical term used in physics, engineering, and general description to specify a type of movement distinct from linear motion. It describes circular or spinning movement.

Examples

• Noun:
  • The rotary motion of the Earth causes day and night.
  • The engineer designed a mechanism to convert linear motion into rotary motion.
  • The rotary motion of the fan blades creates a cooling breeze.

Advanced Usage

• Technical Context: In mechanics, "rotary motion" is often contrasted with "reciprocating motion" or "oscillatory motion."
  • The crankshaft is responsible for changing the pistons' reciprocating motion into the engine's rotary motion.

Variants and Related Words

• Rotation (n): The action or process of rotating; often used interchangeably with "rotary motion."
  • The planet's rotation takes 24 hours.
• Rotational (adj): Relating to or characterized by rotation.
  • The wheel has high rotational speed.
• Revolve (v): To move in a circle around a central point.
  • The moon revolves around the Earth.

Synonyms

• Spinning: The action of turning or whirling around quickly.
• Revolution: A single complete turn around an axis or center.
• Whirling: Rapid rotary movement.

Related Phrases

• Rotary engine: An internal-combustion engine in which power is transmitted directly to rotating components.
• Rotary dial: A circular dial on a telephone, rotated to input numbers.

Notes

• While "rotation" is a more common general term, "rotary motion" emphasizes the physical nature and mechanics of the movement itself. It is frequently used in scientific and technical descriptions.

Noun

1. the act of rotating as if on an axis
   • the rotation of the dancer kept time with the music