Ill. Admin. Code tit. 53 § 400.10
Unless otherwise noted, the following definitions shall apply to this Part:
"Department" - the Index Department of the Secretary of State.
"Depositor" - an attorney licensed or formerly licensed to practice in the State of Illinois who is in possession of a client's will, that attorney's representative, the guardian for that attorney or the personal representative of that attorney's decedent's estate.
"Diligent Search" - a good faith effort to locate the testator using resources such as telephone directories, Internet name searches, last known addresses or telephone numbers, known relatives, the Social Security Death Master File, legal research databases, and other public and private search capabilities.
"Secretary of State" - the Secretary of State of the State of Illinois.
"Testator" - a person who executed a will, other than as a witness or official to whom acknowledgement of signing was given.
"Will" - an original:
will;
codicil;
will and one or more codicils;
trust; or
trust and one or more trust amendments. [15 ILCS 305/5.15 ]
Ill. Admin. Code tit. 53, § 400.10