TITLE: When did the term "tuple" get its current meaning?
QUESTION [8 upvotes]: In a recent discussion, someone told me tuples in the modern meaning (in particular,  tuples are heterogeneous: that is, different elements of a tuple can belong to different sets/have different types) first appeared in Codd's tuple calculus. I was surprised it would be so late, but searching Google Books before 1970, I can't see any clearly heterogeneous examples, and quite a few clearly homogeneous ones ("tuple of ones and zeros", "tuple of natural numbers", etc.) 
Сan anybody confirm that Codd introduced heterogeneous tuples or point out an earlier appearance?

REPLY [5 votes]: Tuples appear in essentially all formal treatments of set theory, and those go back to way before the 70s!