1. a sudden invasion or attack into enemy territory
Usage: military
2. an unwelcome intrusion into another’s domain or sphere

Examples

• The enemy’s incursion across the border was quickly repelled.
• Military forces launched a brief incursion into rebel territory.
• The company viewed the new competitor’s actions as an incursion into their market.
• Border guards reported several incursions by smugglers last month.
• The government condemned the unauthorized incursion into their airspace.
• His constant interruptions felt like an incursion into her personal space.