Definition

1. Adjective:
   • Relating to or indicating a specific direction in space: Used to describe something that operates, receives, or transmits in a particular line or course.
   • Serving to guide or direct: Imposing or providing guidance toward a goal or along a path.
   • Relating to a trend or progression toward a (non-spatial) objective: Pertaining to a purposeful movement or development in a particular field.

Examples of Usage

• Adjective:
  • The hikers used a directional compass to find their way north.
  • A directional antenna focuses the radio signal in one specific direction.
  • The professor discussed the directional trends in contemporary political thought.

Advanced Usage

• "Directional stability": In engineering, the inherent ability of a vehicle (like an aircraft or ship) to maintain its course.

  • The new hull design improved the boat's directional stability in rough seas.

• "Directional derivative": In mathematics, a rate of change of a function along a given direction.

  • Calculating the directional derivative is essential in multivariable calculus.

Variants and Related Words

• Directionally (adverb): In a manner relating to direction.

  • The microphone picks up sound directionally.

• Directionality (noun): The property of having a specific direction or orientation.

  • The directionality of the light beam was crucial for the experiment.

• Bidirectional (adjective): Operating in two directions.

  • The new street allows bidirectional traffic.

• Omnidirectional (adjective): Receiving or transmitting in all directions.

  • An omnidirectional microphone captures sound from all around.

Synonyms

• Guiding: Serving to show the way.
• Directive: Serving to direct or guide.
• Orientational: Relating to orientation or alignment.

Related Phrases

• Directional control: The ability to steer or guide movement.

  • The pilot maintained directional control during the crosswind landing.

• Directional hearing: The ability to perceive the direction from which a sound originates.

  • Owls have excellent directional hearing to locate prey.

Related Idioms

(Note: There are no common idioms that use the exact word "directional." It is primarily a technical adjective.)

Adjective

1. showing the way by conducting or leading; imposing direction on
   • felt his mother's directing arm around him
   • the directional role of science on industrial progress
2. relating to direction toward a (nonspatial) goal
   • he tried to explain the directional trends of modern science
3. relating to or indicating directions in space
   • a directional microphone