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diff --git a/mjo-algebra.tex b/mjo-algebra.tex
index 1ab8880..3bb51c1 100644
--- a/mjo-algebra.tex
+++ b/mjo-algebra.tex
@@ -94,4 +94,17 @@
 % given by its second argument.
 \newcommand*{\Stab}[2]{ #1_{#2} }
 
+
+% The affine algebraic variety consisting of the common solutions to
+% every polynomial in its argument, which should be a subset of some
+% polynomial ring.
+\newcommand*{\variety}[1]{ \mathcal{V}\of{{#1}} }
+\ifdefined\newglossaryentry
+  \newglossaryentry{variety}{
+    name={\ensuremath{\variety{I}}},
+    description={variety corresponding to the ideal $I$},
+    sort=v
+  }
+\fi
+
 \fi