in addition, by way of addition; furthermore
"he serves additionally as the CEO"
By way of addition; in addition to; also.
"Additionally, she decided to bring a map just in case we got lost on the trail."
In plain English: Additionally means something else is also included along with what was already mentioned.
"Additionally, please bring your passport and some cash for tips."
Usage: Use additionally at the beginning or end of a sentence to introduce extra information that supports your main point, but avoid starting every paragraph with it if you want more varied transitions. This word is slightly more formal than "also," so reserve it for written communication rather than casual conversation.
The word additionally comes from combining English additional with the suffix -ly. It was formed to create an adverb meaning "in addition," reflecting its original sense of adding something extra.