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n. 1. An aggressive entrance into foreign territory; a raid or invasion. 2. The act of entering another's territory or domain. 3. The act of entering or running into: homes damaged by the incursion of floodwater. [Middle English, from Old French, from Latin incursiō, incursiōn-, from incursus, past participle of incurrere, to run upon; see INCUR.] |
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