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diff --git a/mjo-common.tex b/mjo-common.tex
index 284d5a5..041a1eb 100644
--- a/mjo-common.tex
+++ b/mjo-common.tex
@@ -39,6 +39,18 @@
 % A seven-tuple of things.
 \newcommand*{\septuple}[7]{ \left({#1},{#2},{#3},{#4},{#5},{#6},{#7}\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.
+\newcommand*{\lcm}[1]{ \operatorname{lcm}\of{{#1}} }
+\ifdefined\newglossaryentry
+  \newglossaryentry{lcm}{
+    name={\ensuremath{\lcm{X}}},
+    description={the least common multiple of the elements of $X$},
+    sort=l
+  }
+\fi
+
 % The factorial operator.
 \newcommand*{\factorial}[1]{ {#1}! }