Restriction

noun

1. The action of restricting or the state of being restricted.

   "the country's restriction of immigration."

2. Something that restricts; a regulation or limitation.

   "a restriction banning dogs from the beach."

3. The act of restricting, or the state of being restricted; limitation; confinement within bounds: as, grounds open to the public without restriction.
4. That which restricts; a restraint: as, to impose restrictions on trade.
5. Reservation; reserve.