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Webster 1913 Edition
Allegation
Alˊle-ga′tion
,Noun.
 [L. 
allegatio
, fr. allegare
, allegatum
, to send a message, cite; later, to free by giving reasons; ad 
+ legare 
to send, commission. Cf. Allege 
and Adlegation
.] 1. 
The act of alleging or positively asserting. 
2. 
That which is alleged, asserted, or declared; positive assertion; formal averment 
I thought their 
allegation 
but reasonable. Steele.
3. 
(Law) 
A statement by a party of what he undertakes to prove, – usually applied to each separate averment; the charge or matter undertaken to be proved. 
Webster 1828 Edition
Allegation
ALLEGA'TION
,Noun.
  1.
  Affirmation; positive assertion or declaration.2.
  That which is affirmed or asserted; that which is offered as a plea, excuse or justification.3.
  In ecclesiastical courts, a formal complaint, or declaration of charges.