Verb

(en verb)

To attach or connect in a secure manner.

The sailor fastened the boat to the dock with a half-hitch.

Fasten your seatbelts!

Can you fasten these boards together with some nails?

* Jonathan Swift

The words Whig and Tory have been pressed to the service of many successions of parties, with very different ideas fastened to them.

To cause to take close effect; to make to tell; to land.

to fasten a blow

* Shakespeare

if I can fasten but one cup upon him

Verb

(en verb)

To restrain within bounds; to limit; to confine; as, to restrict worlds to a particular meaning; to restrict a patient to a certain diet.

* {{quote-news

, year=2011 , date=September 28 , author=Jon Smith , title=Valencia 1 - 1 Chelsea , work=BBC Sport citation , page= , passage=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.}}

(specifically, mathematics) To consider (a function) as defined on a subset of its original domain.

If we restrict sine to $[-\backslash frac\backslash pi2,\backslash frac\backslash pi2]$, we can define its inverse.