un allowed

allowed

[uh-loud]
adjective
Physics. involving a change in quantum numbers, permitted by the selection rules: allowed transition.

Origin:
allow + -ed2

unallowed, adjective

allowed, allude, aloud, elude.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

allow
c.1300, from O.Fr. alouer "approve," from L. allaudare, compound of ad- "to" + laudare "to praise," confused and merged in O.Fr. with alouer "assign," from L. allocare (see allocate). From the first word came the sense "permission based on approval," from the second the
meaning preserved in allowance.
Online Etymology Dictionary, © 2010 Douglas Harper
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