Usage and Grammar
Q. I have often disliked authors in the habit of introducing a statement with Firstly or Secondly, and so on. Are there any good rules on this or should it be banished from usage?
A. Webster’s Collegiate Dictionary (which Chicago follows) seems just fine with firstly, and secondly. And according to the American Heritage Dictionary, the meaning of firstly is "In the first place; to begin with; first." So I guess you’ll have to find another reason for disliking authors.