What does allegation mean?
The definition of allegation
Al`le*ga”tion, n.
Etym: [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.