Internationally means across more than one country. Internationally known, trade internationally, internationally agreed.
It is the word that turns a claim to fame into a bigger one, and internationally renowned is doing much of the work in any biography that uses it. In law it marks rules agreed between states rather than within one.
1adverbinternationallyAcross more than one country.
“The company sells its furniture internationally, from Brazil to Japan.”
internationally is a manner.
From international + -ly.
Etymology from Wiktionary, CC BY-SA