say it: ree-STRIK-shuhn
restriction is a noun meaning "a principle that limits the extent of something". It carries 3 recorded senses.
a principle that limits the extent of something
“I am willing to accept certain restrictions on my movements”
an act of limiting or restricting (as by regulation)
the act of keeping something within specified bounds (by force if necessary)
“the restriction of the infection to a focal area”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for restriction come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.