It's always fun to learn a new word. I encountered this one while playing Hurdle (which I find more challenging that the old Wordle). No other entry was possible for the fourth row; the puzzle confirmed the word and moved me on to the final hurdle.
So, to the dictionaries. Not in the OED (OED-level words are not typically in Hurdle anyway, which like Wordle uses a database of relatively common five letter words). But it wasn't in my 1995 edition of the official Scrabble-players dictionary, which I used for decades.
I found the word in Wiktionary, defined as a "finite sequence of terms," and found more detail in Wikibooks -
Tuples offer another way of storing multiple values in a single value. Tuples and lists have two key differences:Tuples have a fixed number of elements (immutable); you can't cons to a tuple.Therefore, it makes sense to use tuples when you know in advance how many values are to be stored. For example, we might want a type for storing 2D coordinates of a point. We know exactly how many values we need for each point (two – the x and y coordinates), so tuples are applicable.The elements of a tuple do not need to be all of the same type. For instance, in a phonebook application we might want to handle the entries by crunching three values into one: the name, phone number, and the number of times we made calls. In such a case the three values won't have the same type, since the name and the phone number are strings, but contact counter will be a number, so lists wouldn't work.Tuples are marked by parentheses with elements delimited by commas.
Now I understand. Tuple is a word created for programming language, and is not used by normal people in the real world. As soon as I encountered "you can't cons to a tuple" I knew I was wading into quicksand and I carefully backed out.
Note to self: Time passes, language changes, and so does the official lexicon for Scrabble. Maybe it's time to update the dictionary.