transitive verb.
To take or claim for oneself without right; appropriate: synonym: appropriate.
transitive verb.
To ascribe on behalf of another in an unwarranted manner.
The Century Dictionary and Cyclopedia
To claim or demand unduly or presumptuously; lay claim to in an overbearing manner: as, to arrogate power or dignity to one's self.
To lay claim to on behalf of another: as, to arrogate to the crown the privilege of issuing writs.
In Roman law, same as adrogate.
the GNU version of the Collaborative International Dictionary of English
transitive verb.
To assume, or claim as one's own, unduly, proudly, or presumptuously; to make undue claims to, from vanity or baseless pretensions to right or merit.