Origin of déjà vu
Word Origin for déjà vu
1903, from French déjà vu, literally "already seen." The phenomenon also is known as promnesia. Similar phenomena are déjà entendu "already heard" (of music, etc.), 1965; and déjà lu "already read."
The strange sensation that something one is now experiencing has happened before: “I knew I had never been in the house before, but as I walked up the staircase, I got a weird sense of déjà vu.” From French, meaning “already seen.”