What is a declarative definition in an sentence?
I have never heard of a "declarative definition" as a grammatical term, and I find nothing online that makes sense. (It all seems to have to do with the tech business and maybe computer programming somehow.)
http://www.ingentaconnect.com/content/rodopi/lang/2002/00000045/00000001/art00012
http://www.wipo.int/pctdb/en/wo.jsp?IA=WO2007108879&wo=2007108879&DISPLAY=CLAIMS
etc.
So ... I would say that it's probably a straightforward definition of a term in a declarative sentence. Here's my guess for an example:
In computer usage, download means to transfer a file from an Internet website to one's own computer.
??