Deja vu American noun informal
Deja vu is an anomaly of memory. Although the sense of recollection such as the time, place and practical context experience are very strong, they are not believed to be possible. People who are under high pressure tend to experience deja vu more than others; or because they travel or watch more movies than others.
I entered the classroom, looked around and suddenly felt a sense of deja vu.
That new music video has a sense of deja vu about it.
To try to imagine how would you feel if you were in someone's else situation
A feeling of tremendous ease or happiness.
Its most common use by far is literal. Moreover, deja vu may also be used disparagingly or dismissively.
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The term deja vu is French, supposed to exist at 1900–05 and literally means "already seen." Those who have experienced the feeling describe it as an overwhelming sense of familiarity with something that they have just met for the first time.
Adequate measures or actions
There were no half measures in the wedding from the very beginning to the end.