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  • $\begingroup$ You have changed the Cell option value for SingleLetterItalics to False and you still get this behavior? $\endgroup$ Commented Dec 1, 2016 at 23:29
  • $\begingroup$ Please show the sourcecode that led to the errant typeface. Did you define a as a variable somewhere else? $\endgroup$ Commented Dec 1, 2016 at 23:59
  • $\begingroup$ Thanks for answering so quickly. Selecting the cell and right-clicking on "properties" brings up an "options inspector" dialog. Setting SingleLetterItalics to False in that dialog fixes the problem for that cell. Selecting "Global Preferences" in the Show option values dropdown shows False, but new cells still have the option set to False. Is there a way to do this globally? $\endgroup$ Commented Dec 2, 2016 at 0:06
  • $\begingroup$ @David, I get Cell[BoxData[ FormBox[ RowBox[{"Define", " ", "a", " ", "rotation"}], TraditionalForm]], "Text",.... a isn't defined anywhere else. This behavior occurs anytime I type a single letter. $\endgroup$ Commented Dec 2, 2016 at 0:17
  • $\begingroup$ Why not... "Define a rotation" instead of "Define", " ", "a", " ", "rotation"? $\endgroup$ Commented Dec 2, 2016 at 1:05