(810 ILCS 5/2-606) (from Ch. 26, par. 2-606)
Sec. 2-606. What constitutes acceptance of goods.
(1) Acceptance of goods occurs when the buyer
(a) after a reasonable opportunity to inspect the goods signifies to the seller that the goods are conforming or that he will take or retain them in spite of their non-conformity; or (b) fails to make an effective rejection (subsection (1) of Section 2-602, but such acceptance does not occur until the buyer has had a reasonable opportunity to inspect them; or (c) does any act inconsistent with the seller's ownership; but if such act is wrongful as against the seller it is an acceptance only if ratified by him. (2) Acceptance of a part of any commercial unit is acceptance of that entire unit.
(Source: Laws 1961, p. 2101.)