In parroting can we include the word in it at all in the entire FRQ or just not in the definition portion?
More so in the definition portion, but keep it in mind overall. You aren’t going to lose points by reusing the term; you just won’t score points if that’s all you can do with it.
It is perfectly acceptable to re-use the word in your FRQ response. However, you should try to define the term in your own words and then EXPLAIN how a specific element in the prompt is displayed using the vocabulary term.
For instance, if one of the terms is “mood-congruent memory,” you should define it and then say "such-and-such is an example of mood-congruent memory because [fill in the blank].