This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An aggressive entrance into foreign territory; a raid or invasion.

n. The act of entering another's territory or domain.

n. The act of entering or running into: homes damaged by the incursion of floodwater.

n. An aggressive movement into somewhere; an invasion.

n. A running into; hence, an entering into a territory with hostile intention; a temporary invasion; a predatory or harassing inroad; a raid.

n. Attack; occurrence.

n. A running in or into something; an inroad or invasion.

n. Synonyms Irruption, raid.

n. an attack that penetrates into enemy territory

n. the mistake of incurring liability or blame

n. the act of entering some territory or domain (often in large numbers)

"Moammar Gadhafi's regime over what it called an incursion by Libyan forces, the Foreign Ministry said."

mistake    error    fault    incoming    ingress    entry    entrance    entering   

raid    foray    onset    invasion    irruption    inroad    attack    sally    occurrence    movement   

Persian    aspersion    aversion    conversion    dispersion    diversion    excursion    immersion    inversion    perversion   

inroad    irruption    inroads    irruptions    counterattack    depredation    setback    foray    confrontation    raid