(from French) Already. In German, this adverb is used almost exclusively as part of the expression 'Déjà-vu' (literally: already seen) to describe the feeling of having experienced a new situation before.
example
Die Argumente in der Diskussion kamen mir alle déjà vu vor.
The arguments in the discussion all seemed like déjà vu to me.
Usage tips
Fixed expression
The word 'déjà' is almost never used on its own in German, but almost always as part of the term 'Déjà-vu' (déjà vu) or 'Déjà-vu-Erlebnis' (déjà vu experience). It is a loanword from French.
EXAMPLE
Als ich die Stadt betrat, hatte ich ein starkes Déjà-vu.
When I entered the city, I had a strong feeling of déjà vu.
Use in a sentence
The most common way to use this term is the expression 'ein Déjà-vu haben' (to have déjà vu). The noun 'Déjà-vu' is neuter: das Déjà-vu.
EXAMPLE
Hattest du schon einmal das Gefühl, ein Déjà-vu zu haben?
Have you ever had the feeling of having déjà vu?
Common mistake
Do not use 'déjà' as a general synonym for 'schon' (already) or 'bereits' (already). It is limited to the fixed expression 'Déjà-vu' (déjà vu) and cannot be freely substituted in a sentence.
EXAMPLE
Ich habe diese Serie schon gesehen.
I have already seen this series.
Compare with
synonym
déjà vs schon
already
'schon' and 'déjà' basically mean 'already'. In a normal German sentence, you almost always use 'schon'. 'déjà' is a French word and appears in German mainly in the fixed expression 'Déjà-vu'. This refers to the feeling of having experienced a new situation before. As a simple adverb, 'déjà' does not normally replace 'schon' in German. So for everyday sentences, 'schon' is the natural choice.
déjà
Beim Betreten der Wohnung hatte ich plötzlich ein Déjà-vu.
When I entered the apartment, I suddenly had a feeling of déjà vu.