What's the best name for a non-mutating “add” method on an immutable collection?

Question

Sorry for the waffly title - if I could come up with a concise title, I wouldn\'t have to ask the question.

Suppose I have an immutable list type. It has an operat

Answer 1

Looking at http://thesaurus.reference.com/browse/add and http://thesaurus.reference.com/browse/plus I found gain and affix but I'm not sure how much they imply non-mutation.