restrict

Etymology

Borrowed from Latin restrictus, perfect passive participle of restringō (“draw back tightly; restrain, restrict”), from re- (“back, again”) + stringō (“press, tighten, compress”). Doublet of ristretto as an adjective.

verb

1. To restrain within boundaries; to limit; to confine
   After suffering diahrroea, the patient was restricted to a diet of rice, cold meat, and yoghurt.
   It was no less than Valencia deserved after dominating possession in the final 20 minutes although Chelsea defended resolutely and restricted the Spanish side to shooting from long range. September 28, 2011, Jon Smith, “Valencia 1 - 1 Chelsea”, in BBC Sport
2. (specifically, mathematics) To consider (a function) as defined on a subset of its original domain.
   If we restrict sine to [-π/2,π/2], we can define its inverse.

adj

1. (obsolete) Restricted.