Section 21601 Of Chapter 1. General Provisions From California Probate Code >> Division 11. >> Part 6. >> Chapter 1.

. (a) For purposes of this part, "decedent's testamentary instruments" means the decedent's will or revocable trust.
  (b) "Estate" as used in this part shall include a decedent's probate estate and all property held in any revocable trust that becomes irrevocable on the death of the decedent.