The following words and phrases when used in this chapter shall have the meanings given to them in this section unless the context clearly indicates otherwise:
"Accounting period." A calendar year unless another 12-month period is selected by a fiduciary. The term includes a portion of a calendar year or other 12-month period which begins when an income interest begins or ends when an income interest ends.
"Beneficiary." Includes:
"Income." Money or property which a fiduciary receives as current return from a principal asset. The term includes a portion of receipts from a sale, exchange or liquidation of a principal asset to the extent provided in Subchapter D (relating to allocation of receipts during administration of trust).
"Income beneficiary." A person to whom or which net income of a trust is or may be payable.
"Income interest." The right of an income beneficiary to receive all or part of net income, whether the governing instrument requires it to be distributed or authorizes it to be distributed in the trustee's discretion.
"Mandatory income interest." The right of an income beneficiary to receive net income which the governing instrument requires the fiduciary to distribute.
"Net income." The:
"Principal." Property held in trust for distribution to a remainder beneficiary when the trust terminates or property held in trust in perpetuity.
"Remainder beneficiary." A person entitled to receive principal when an income interest ends.
"Sui juris beneficiary." Includes:
"Trustee." Includes an original, additional or successor trustee whether or not appointed or confirmed by a court.
20 Pa.C.S. § 8102