This is the 15373rd most frequent German word.
vereidigten
"Vereidigten" means "sworn" or "officially sworn in."
Here, 'vereidigten' is used as the past tense of the verb 'vereidigen', meaning 'to swear in', referring to officially administering an oath to the witnesses.
Die Richter vereidigten die neuen Zeugen für den Prozess.
The judges swore in the new witnesses for the trial.
In this sentence, 'vereidigten' appears in the passive voice, describing the state of the representatives being sworn in.
Als die Abgeordneten vereidigten wurden, begann ihre Amtszeit.
When the representatives were sworn in, their term began.
Here, 'vereidigten' signifies the action performed by the president in a formal ceremony of administering an oath.