This is the 786th most frequent Hebrew word.
בטענה
"בטענה" means "with a claim" or "arguing."
In this sentence, 'בטענה' is used to indicate the reason or claim he made during his legal pursuit.
הוא פנה לבית המשפט בטענה שהזכויות שלו הופרו.
He approached the court claiming that his rights were violated.
In this context, 'בטענה' explains the reason she provided for her action to leave.
היא עזבה את החדר בטענה שהיא מרגישה עייפה מדי.
She left the room claiming that she felt too tired.
Here, 'בטענה' introduces the assertion made by the lecturer to emphasize the significance of the topic.