Definition

1. Adjective:
   • Currently being used or operated: Describes something that is actively employed or functioning at the present time.
   • (Of a facility or service) Occupied and therefore unavailable: Indicates that a shared resource, such as a telephone line, restroom, or meeting room, is currently occupied by someone and not free for others to use.

Usage

• The phrase "in use" functions as an adjective and typically follows a linking verb like "is," "are," "was," or "were." It describes the state of the subject.
• It is commonly used in formal, technical, and everyday contexts to indicate active operation or occupancy.

Examples

• Adjective:
  • The laboratory equipment is currently in use for an important experiment.
  • All the conference rooms are in use until 3 PM.
  • Please wait; the restroom is in use.
  • Traditional farming methods are still in use in many parts of the country.

Advanced Usage

• "to be in use": The standard phrase to indicate something is being utilized.
  • The old factory is no longer in use.
• "to come into use": To begin to be used or adopted.
  • Electric cars are coming into use more widely.
• "to go out of use": To become obsolete or no longer used.
  • That type of machinery went out of use decades ago.

Variants and Related Words

• In-use (adj): Often hyphenated when used attributively before a noun.
  • The in-use software license must be renewed.
• Usage (n): The act or manner of using something; the state of being used.
  • The usage of plastic has decreased.
• Usable (adj): Able to be used.
  • The device is old but still usable.

Synonyms

• Occupied: (For facilities) Being used by someone.
• Engaged: (Chiefly British) In use, especially of a telephone line.
• Operational: Functioning and in active service.
• Active: Currently functioning or in operation.

Antonyms

• Available: Free to be used.
• Unoccupied: Not being used.
• Idle: Not active or in use.
• Out of service: Not functioning or available for use.

Related Phrases

• In operation: Functioning or working.
  • The new system is now in operation.
• Out of order: Not working; broken.
  • The elevator is out of order.

Adjective

1. currently being used
   • robots are in use throughout industry
2. (of facilities such as telephones or lavatories) unavailable for use by anyone else or indicating unavailability; (`engaged' is a British term for a busy telephone line)
   • her line is busy
   • receptionists' telephones are always engaged
   • the lavatory is in use
   • kept getting a busy signal