prohibit is on the Academic Word List. Pronunciation (UK) IPA (key): /prəˈhɪbɪt/ or /prəʊˈhɪbɪt/ (US) IPA (key): /proʊˈhɪbɪt/ or /prəˈhɪbət/ Audio (US)(file) Verb Plain form prohibit Third-person singular prohibits Past tense prohibited Past participle prohibited Present participle prohibiting If you prohibit something, you say that it must not be done. The laws were changed to prohibit the use of certain tools. Company policy is to prohibit dogs from entering the store. If x {\displaystyle x} prohibits y {\displaystyle y} , y {\displaystyle y} is not possible because of x {\displaystyle x} . The use of a password prohibits access to outsiders. Synonyms ban forbid block prevent Antonyms allow permit encourage Related words prohibition/Prohibition prohibitiveWikiwand - on Seamless Wikipedia browsing. On steroids.