fo·rin·sec \fəˈrin(t)sə̇k\adjective Etymology: Medieval Latin forinsecus, from Latin, from outside, from foris outside + -insecus (as in extrinsecus on the outside) — more at forum, extrinsic of obligations under feudal law: extraordinary in nature or performed away from the holding of a mesne lord for his superior < forinsec service included foreign military service, the supplying of labor, and certain payments >