This is the 32nd most frequent Hebrew word.
אז
"Then," "since," or "so."
'אז' is used to indicate a reason or resulting action.
אז הלכתי לחבר לראות מה קורה שם.
So, I went to my friend to see what was happening there.
'אז' provides a sequential order of events.
יצאנו לים ואז התחיל לרדת גשם.
We went to the beach, and then it started raining.
'אז' serves as a contextual consequence or result.