Something I thought of from the top of my head
You have to post the definition of the word from before, and then post a word that has at the first letter of it in the word.
Example:
It - used to refer to a thing previously mentioned or easily identified.
Next word - Definition
Definition - a statement of the exact meaning of a word, especially in a dictionary.
Next word - Disestablishmentarionism
You get the idea.
I'll start
First word - Aconitum