Correct spelling, explanation: the adjective international is the base word here, while the suffix added to change it into an adverb is -ly. The adverb suffix is always -ly and there are no instances where it’s different so in order to create an adverb it has to be added. So on top of the ending l of international it forms the only correct version of the word: internationally.
Definition of internationally:
1. Across many nations in the world.
TOEIC is an internationally approved and respected English proficiency exam.
The shipment for this product is available both locally and internationally.
Incorrect spelling, explanation: the word
internationaly instinctively seems like it’s lacking something. When you know that the base word is international, the sole y at the end seems out of place and unclear. It’s not until you add the other l, and form a full and proper suffix -ly, that the adverb becomes understandable.
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