"permissible" in the adjective sense
1. permissible, allowable
that may be permitted especially as according to rule
"permissible behavior in school"
"a permissible tax deduction"
2. permissible
that may be accepted or conceded
"a kind of speculation that was permissible in cosmology but inadmissible in medicine"
Source: WordNet® (An amazing lexical database of English)
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