Origin: Latin prefix inter-
Internationally has 2 different meanings across 1 category:
throughout the world
"She is internationally known"
"this is globally significant"
In an international manner.
"The new trade agreement was signed internationally to promote cooperation among all member nations."
In plain English: Internationally means something happens across many different countries around the world.
"The company has been expanding internationally for over ten years."
The word internationally comes from combining the adjective international with the adverb suffix -ly. It was formed to describe actions or states that occur on a global scale.