What term best fits the meaning of 'in addition' or 'also'?

The term that best fits the meaning of 'in addition' or 'also' is 'moreover.' This word is frequently used to introduce an additional piece of information that supports or enhances the argument or point being made. It implies a continuation of a thought and adds weight to the previous statement, making it a useful transitional tool in writing.

While 'furthermore' and 'additionally' also convey a similar meaning of adding information, 'moreover' is often preferred in academic and formal writing for its strong emphasis on the connection between ideas. On the other hand, 'notwithstanding' serves a different purpose; it indicates a contrast or exception, rather than an addition, making it unsuitable in this context.