If you want to keep the headings and explanation under them format it might be possible to place each of the definitions, including its header, in a file named after the definition. something along the lines of:
===== Dokuwiki =====
The most flexible wiki. It is available to all users of this site.
Either store these files in a separate subdirectory, or alternatively store them in the same directory but with a different file type (let's say .lis) then you can build the page with something like:
$ cat *.lis >$WIKIPAGE
Alternatively there is the include plugin which can work over a complete namespace. I've never used the include plugin, so you'd need to test it out yourself.