. . . . "(6) ???Disclaimer??? means the refusal to accept an interest in or power over property. (7) ???Fiduciary??? means a personal representative, trustee of a trust, agent acting under a power of attorney, conservator, custodian under a Uniform Transfers to Minors Act or similar statute of any jurisdiction, guardian, or other person authorized to act as a fiduciary with respect to the property or power" .