Definition of the word who

The word "who" has a rich history. It originated from Old English "hwa", which was a pronoun used to ask questions about person or people. This Old English word is thought to have come from the Proto-Germanic "*hwaz", which was also the source of the Modern German "wer" (who) and the Dutch "wie" (who). In Middle English (circa 1100-1500), "who" evolved into "hwo" or "wha", and by the 15th century, it had taken on its modern form. Despite its long history, "who" has retained its basic meaning, still being used to ask questions about people or things, such as "Who is that?" or "Who did you invite to the party?" I hope that answers your question!