1. “Beneficiary” means and includes any person entitled, but for his disclaimer, to take an interest, as grantee; as donee; under any assignment or instrument of conveyance or transfer; by succession to a disclaimed interest, other than by will, intestate succession or through the exercise or nonexercise of a testamentary power of appointment; as beneficiary of an inter vivos trust or insurance contract; pursuant to the exercise or nonexercise of a nontestamentary power of appointment; as donee of a power of appointment created by a nontestamentary instrument; or otherwise under any nontestamentary instrument;

2. “Interest” means and includes the whole of any property, real or personal, legal or equitable, or any fractional part, share or particular portion or specific assets thereof or any estate in any such property including but not limited to a joint tenancy interest in any such property, or power to appoint, consume, apply or expend property or any other right, power, privilege or immunity relating thereto; and

3. “Disclaimer” means a written instrument which declines, refuses, releases or disclaims an interest which would otherwise be succeeded to by a beneficiary, which instrument defines the nature and extent of the interest disclaimed thereby and which must be signed, witnessed and acknowledged by the disclaimant in the manner provided for deeds of real estate.