This verb ultimately comes from the late-Latin *exlītigāre via the Old French esligier and the Anglo-Norman aligier, meaning to clear at law. One might think that it comes from the Latin allēgāre, which has the same meaning as the modern English word, but this similarity is due to later conflating the two terms. If it came from the latter root, the modern form would be alleague.

The original sense of allege was to make an oath. It appears in the anonymous poem The Pearl, c.1325:

Forþy to corte quen þou schal com
Þer alle oure causeȝ schal be tryed,
Alegge þe ryȝt, þou may be innome,
By þys ilke spech I haue asspyed

(Therefore to court when you shall come
There all our cases shall be tried,
Allege the right. You may be caught out,
By this same speech I have spied.)

The sense meaning to assert without proof, which is the sense most in use today, appears shortly after. From William Langland’s 1377 Piers Plowman (B text):

Þei wol allegen also, quod I, and by þe gospel preuen.
(They will allege also, say I, and by the gospel prove.)1

1Oxford English Dictionary, allege, v.2, 2nd Edition, 1989, Oxford University Press, accessed 25 Dec 2008 <>.

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