Print glossary of a math textbook shows paragraphs blocked at cell 1 with each entry word/term followed by its definition on the same line. Some entries show examples. Formats 2016, Sec. 21.6.5.c says to make the entry word a cell-5 heading, with a blank line above it, I assume. Should the definition be formatted as a 3-1 paragraph beginning on the line following the entry word because Nemeth rules call for 3-1 paragraphs even if paragraphs are shown blocked at cell 1?
Yes, that is correct. When following Nemeth Code formatting rules, the first line of a narrative paragraph is indented two cells from the runover margin. Section 190.a of the Nemeth Code says "paragraphs must begin in cell 3 and must be run over, if necessary, in cell 1." This is the correct placement for narrative that follows a cell-5 heading. Have fun with that glossary!