If something is permissible, it is considered to be acceptable because it does not break any laws or rules. Religious practices are permissible under the Constitution. allowed by law or by the rules = allowable impermissible
that may be permitted especially as according to rule; "permissible behavior in school"; "a permissible tax deduction" that may be accepted or conceded; "a kind of speculation that was permissible in cosmology but inadmissible in medicine