In normal English usage, two or more things, itemised.

In Computer Science, however, a list may have one item, none, or any other number of members. A list in computer science may contain a mixture of single items: atoms, and other lists. You can represent pretty much anything as a list. For example, a sum like (3*4)+(5/6) may be represented as the list (+ ( * 3 4 ) ( / 5 6 ) ) -- that is a list containing three elements, "+", and the lists ( * 3 4 ) and ( / 5 6 ).