1. 容许的；许可的
If something is permissible, it is considered to be acceptable because it does not break any laws or rules.

1. that may be permitted especially as according to rule

e.g. permissible behavior in school
a permissible tax deduction

Synonym: allowable

2. that may be accepted or conceded

e.g. a kind of speculation that was permissible in cosmology but inadmissible in medicine