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Webster 1913 Edition

Noun.

[L.

arrogatio

, fr.

arrogare

. Cf.

The act of arrogating, or making exorbitant claims; the act of taking more than one is justly entitled to.

Hall.

(Civ. Law)

Adoption of a person of full age.

Noun.

The act of arrogating, or making exorbitant claims; the act of taking more than one is justly entitled to.

arrogation ‎(plural arrogations)

(law) The unjust assumption of rights or privilege.
The President's arrogation of this new Act oversteps his bounds and causes our rights to suffer.

the unjust assumption of rights or privilege