Definition

1. Adjective:
   • Relating to a sudden, violent, or forcible entry or invasion: Describes something that bursts in or intrudes abruptly and often disruptively.
   • (Geology) Of igneous rock that has solidified beneath the earth's surface: Describes rock, such as granite, that forms from magma cooling and crystallizing underground (also called intrusive or plutonic rock).

Usage Examples

• Adjective (General):

  • The irruptive behavior of the protesters overwhelmed the security guards.
  • An irruptive wave of migrants created a humanitarian crisis at the border.

• Adjective (Geology):

  • Granite is a common type of irruptive rock.
  • The mountain range is composed primarily of irruptive formations like diorite and gabbro.

Advanced Usage

• "irruptive species": In ecology, a species that experiences a sudden, rapid increase in population, often moving into new areas.

  • Some bird species are considered irruptive, appearing in large numbers in regions where they are not typically found.

• "irruptive growth": A sudden and often disruptive period of expansion or increase.

  • The company's irruptive growth led to significant management challenges.

Variants and Related Words

• Irrupt (verb): To enter forcibly or suddenly; to increase rapidly in number.
  • The crowd irrupted into the stadium.
• Irruption (noun): A sudden, violent entry or invasion; a sharp increase in numbers.
  • The irruption of lava from the volcano was devastating.
  • There was an irruption of interest in the new technology.

Synonyms

• Intrusive: Tending to intrude; (in geology) formed by intrusion.
• Invasive: Tending to spread invasively.
• Explosive: Suddenly and violently breaking out.
• Plutonic (Geology): Synonym for igneous rock formed deep underground.

Related Phrases

• To make an irruption: To burst or break in suddenly.
  • The rebels made a violent irruption into the capital.

Related Idioms

• None commonly associated directly with "irruptive." The related noun "irruption" is more frequently used in figurative language.
  • An irruption of violence describes a sudden outbreak.
  • An irruption of color describes a vivid, sudden appearance.

Adjective

1. of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro