This is the 752nd most frequent French word.
attendu
"Attendu" means "expected" in English.
Here, 'attendu' is used as an adjective meaning 'long-awaited' or 'expected' in conjunction with a past participle to describe the book.
Le livre attendu depuis longtemps est enfin arrivé.
The long-awaited book has finally arrived.
In this sentence, 'attendu que' functions as a conjunction meaning 'considering that' or 'given that,' introducing the reason or basis for the action occurring.
Attendu qu'il pleut, la sortie a été annulée.
Given that it is raining, the outing has been canceled.
Here, 'attendu' is part of a verbal phrase in the passive construction, meaning 'was awaited,' indicating that someone was expected or waited for at a particular location.