DÉJÀ VU definition: 1. the strange feeling that in some way you have already experienced what is happening now: 2. a…. Learn more., Déjà vu is a sense of having already seen something you're currently seeing or experiencing—coupled with knowing you haven’t actually seen it, which is why it catches many people so off guard. It is thought to be the equivalent of a small brain “glitch,” with two streams of thought colliding., Déjà vu is a fleeting, false memory — it can be harmless or a sign of something more. Déjà vu is a fleeting sensation of having already lived a totally identical situation at some point in the past — though, in reality, you haven’t. Translated from French, déjà vu means “already seen.” Cleveland Clinic is a non-profit academic medical center., Have you ever had the sense that you’ve done something or gone through a new situation before? Does it seem like you know what’s going to happen next? That feeling is often described as déjà vu,, Déjà vu definition: the illusion of having previously experienced something actually being encountered for the first time.. See examples of DÉJÀ VU used in a sentence., déjà vu, a sense that one has experienced a situation before. The feeling of déjà vu is often fleeting, lasting only a few seconds or minutes, though individuals’ reactions to the sensation may linger for some time. Most people experience déjà vu on occasion, especially young adults. It is often triggered by sights, sounds, or smells..