omissions should be understood as exclusions. Burke v. 12 Rothschild’s Liquor Mart, Inc., 148 Ill. 2d 429, 441-42 (1992).
This rule of statutory construction, expressio unius est exclusio alterius, is based on logic and common sense. It expresses the learning of common experience that when people say one thing they do not mean something else. The maxim is closely related to the plain language rule in that it emphasizes the statutory language as it is written. 2A N. Singer, Sutherland on Statutory Construction § 47.24, at 228, § 47.25 at 234 (5th ed. 1992).
The appellate court cited two reasons for reading the requirements of section 1502.1 of the Act into section 604, despite the fact that section 1502.1(E) does not list section 604. First, the appellate court stated that "[t]here is no indication this list was intended to be exclusive.” 284 Ill. App. 3d at 365.
However, the inference that all omissions should be understood as exclusions stands despite the lack of any negative words of limitation. Solich v. George & Anna Portes Cancer Prevention Center of Chicago, Inc., 158 Ill. 2d 76, 82 (1994); City Savings Ass’n v. International Guaranty & Insurance Co., 17 Ill. 2d 609, 612 (1959). Thus, the absence of section 604 from section 1502.1(E)’s list infers the legislative intent that section 1502.1’s definition of "last employer” is exclusive to the sections cited in the list. An explicit statement of such intent is unnecessary.
Second, the appellate court reasoned that if it did not apply section 1502.1’s definition of "last employer” to the term "last employed” in section 604, these substantially same terms would have different meanings in the same statute. The appellate court invoked the principle that where the same or substantially the same words or phrases appear in different parts of a statute, they should be given a consistent meaning unless a contrary legislative intent is clearly expressed.