1. people who enter a place by force in order to take control of it
Usage: plural of invader
2. organisms that spread into and harm a new environment
Usage: biology; ecology

Examples

• The ancient city fell to foreign invaders after a long siege.
• Local forces fought bravely against the invaders.
• Historians study how invaders changed the culture of conquered lands.
• The castle walls were built to keep out invaders.
• Invasive plant species are considered biological invaders.
• Scientists track how these invaders affect local ecosystems.
• The documentary showed how invaders disrupted native wildlife.