Main Entry: in·cur·sion

Pronunciation: \in-ˈkər-zhən\

Function: noun

Etymology: Middle English, from Middle French or Latin; Middle French, from Latin incursion-, incursio, from incurrere

Date: 15th century

1 : a hostile entrance into a territory : raid
2 : an entering in or into (as an activity or undertaking) <his only incursion into the arts>