permissible

[per-mis-uh-buhl]
adjective
  1. that can be permitted; allowable: a permissible amount of sentimentality under the circumstances; Such behavior is not permissible!

Origin of permissible

First recorded in 1400–50; late Middle English word from Medieval Latin word permissibilis. See permission, -ible
Related formsper·mis·si·bil·i·ty, per·mis·si·ble·ness, nounper·mis·si·bly, adverbnon·per·mis·si·bil·i·ty, nounnon·per·mis·si·ble, adjectivenon·per·mis·si·bly, adverbun·per·mis·si·ble, adjectiveun·per·mis·si·bly, adverb

Synonyms for permissible

allowed, sanctioned, lawful, legal, tolerated.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for non-permissible

permissible

adjective
  1. permitted; allowable
Derived Formspermissibility, nounpermissibly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for non-permissible

permissible

adj.

early 15c., from Old French permissible (15c.) and directly from Medieval Latin permissibilis, from permiss-, past participle stem of Latin permittere (see permit (v.)).

Online Etymology Dictionary, © 2010 Douglas Harper