The word "barely" is an adverb used to indicate that something is only just the case or is true to a very small extent. When you say something happens "barely," it means it almost didn't happen or was very close to not happening at all. It emphasizes the minimal amount or degree of something.
The word "barely" comes from the word "bare" which means exposed or uncovered, combined with the suffix "-ly" which is used to form adverbs. It originated in the late Middle English around the 14th century, originally meaning "in a bare manner."