epsilon-neighborhood

[ ep-suh-lon-ney-ber-hoo d, -luh n- or, esp. British, ep-sahy-luh n- ]
/ ˈɛp səˌlɒnˌneɪ bərˌhʊd, -lən- or, esp. British, ɛpˈsaɪ lən- /

noun Mathematics.

the set of all points whose distance from a given point is less than some specified number epsilon.

Words nearby epsilon-neighborhood