per·mis·si·ble 
/ˌpɚˈmɪsəbəl/ adjective
/ˌpɚˈmɪsəbəl/ adjective formal : allowed or permitted by laws or rules
▪ permissible levels of noise — often + to ▪ It is not permissible for students to wear hats in school. — opposite impermissible
▪ permissible levels of noise — often + to ▪ It is not permissible for students to wear hats in school. — opposite impermissible
