This is the 4603rd most frequent Arabic word.
إثره
"إثره" means "immediately after him/it."
Here, 'إثره' implies 'right after him,' denoting immediacy in action.
خرج من المنزل إثره مباشرة.
He left the house right after him.
In this context, 'إثر' indicates 'following,' pointing to the consequence or result of the discussion.
تمكنا من الوصول إلى الحل إثر المناقشة المطولة.
We managed to arrive at a solution following the lengthy discussion.
In this sentence, 'إثر' conveys 'because of' or 'as a result of,' signifying the effect of the meeting on the subject.