Should i write terminology at front or last in assignment?

Hello,

In most course books the terminologies section is usually written in the end giving brief definitions of all the terminologies used in the assignment/report in alphabetical order so that the reader can easily read it.But it depends on your topic and thought,there is no compulsion to write it in the end,if you feel the reader would be able to understand your assignment better if he reads the terminology at the start of the assignment you can mention it at the start as well.

But firstly make sure to ask and confirm with your assigned teacher/guide in case there is a specific format that has been provided to you by them.

All the best!