Déjà vu was the term – from the French language for "already seen" – used to describe the experience of feeling that the current situation had occurred before. The corresponding term in Klingonese was "nIb'poH." Tuvok referred to the phenomenon as a "paradoxical state-dependent associative phenomenon." The experience of déjà vu was also associated with the phenomenon of alternate realities. (ENT: "Future Tense"; TNG: "Cause and Effect"; VOY: "Favorite Son")

In 2364, Geordi La Forge described an incident aboard the USS Enterprise-D when a moment in time repeated itself as a feeling of déjà vu. (TNG: "We'll Always Have Paris")

In 2368, the explosion of the warp core of the Enterprise next to a highly localized temporal distortion triggered a temporal causality loop. The loop made the crew of the Enterprise relive the same twenty-hours over and over again inside an independent fragment of time. Every time the loop repeated, the memories of the crew "reset" until eventually memories from previous loops began to imprint themselves to the persons inside the loop, manifesting first in a form similar to the feeling of déjà vu. (TNG: "Cause and Effect")

In 2373, Ensign Harry Kim claimed that the USS Voyager had already visited the Taresian homeworld. Kim felt an alternate reality might explain the intense sense of déjà vu regarding the region of space in the Delta Quadrant, until a Taresian retrovirus was found to be the actual cause of the unexplained memories in his brain. (VOY: "Favorite Son")

In 2374, Kathryn Janeway said "Déjà vu" when she and Seven found themselves in the "USS Dauntless" brig, as they had nine months before aboard Voyager. (VOY: "Hope and Fear")

In 2378, Admiral Janeway asked if she was "the only one experiencing déjà vu" when her younger self strove to find a way to destroy a transwarp hub rather use it to get Voyager home. Admiral Janeway considered this situation paralleled Captain Janeway's decision of seven years before to destroy the Caretaker's array. (VOY: "Endgame")

A prop from "Past Tense, Part I" listed Julian Bashir as suffering from "Deja Vu Syndrome". [1]

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