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diff --git a/mjo-common.tex b/mjo-common.tex
index 6b357ab..ccb22da 100644
--- a/mjo-common.tex
+++ b/mjo-common.tex
@@ -39,6 +39,12 @@
 % A seven-tuple of things.
 \newcommand*{\septuple}[7]{ \left({#1},{#2},{#3},{#4},{#5},{#6},{#7}\right) }
 
+% A free-form tuple of things. Useful for when the exact number is not
+% known, such as when \ldots will be stuck in the middle of the list,
+% and when you don't want to think in column-vector terms, e.g. with
+% elements of an abstract Cartesian product space.
+\newcommand*{\tuple}[1]{ \left({#1}\right) }
+
 % The "least common multiple of" function. Takes a nonempty set of
 % things that can be multiplied and ordered as its argument. Name
 % chosen for synergy with \gcd, which *does* exist already.