[css-grid] Don't even know does this sentence means. Put in an understandable definition instead.

Author: fantasai

css-grid/Overview.bs

@@ -442,8 +442,7 @@ Grid Tracks and Cells</h3>
 	Adjacent <a>grid tracks</a> can be separated by <a href="#gutters">gutters</a> or <a href="#grid-align">alignment spacing</a>,
 	but are otherwise packed tightly.
 
-	A <dfn export>grid cell</dfn> is the similar term for the full grid&mdash;it
-	is the space between two adjacent row and two adjacent column <a>grid lines</a>.
+	A <dfn export>grid cell</dfn> is the intersection of a grid row and a grid column.
 	It is the smallest unit of the grid that can be referenced when positioning <a>grid items</a>.
 
 	<div class="example">