in addition
"computer chess games are getting cheaper all the time; furthermore, their quality is improving"
"the cellar was dark; moreover, mice nested there"
"what is more, there's no sign of a change"
In addition; besides; further ; what's more (i.e. to denote additional information).
"The project was already over budget, and furthermore, it is running three weeks behind schedule."
In plain English: Furthermore is used to add more information or another point to what you just said.
"She was already late, and furthermore, she forgot to bring her report."
Usage: Use furthermore to introduce an additional point that supports or expands on what was just stated, typically starting a new sentence or clause. It creates a formal tone and should not be used to simply repeat information or add trivial details.
Furthermore comes from Middle English, where it was formed by combining the word "further" with the suffix "-more." This construction originally meant something additional or in addition to what had already been said.