1To meet someone at a prearranged time and place — to arrange a rendezvous. Extremely common in everyday conversation, for meeting friends, business appointments, and the like.
駅前で友達と3時に待ち合わせる約束をした。
I made plans to meet my friend at the station at 3 o'clock.
初対面の人と待ち合わせるときは、少し緊張する。
I get a little nervous when meeting someone for the first time at an arranged spot.
遅刻しそうだったので、待ち合わせ場所を変更してもらった。
Since I was going to be late, I had them change the meeting spot.
同窓会の前に、駅の改札口で待ち合わせることになった。
We arranged to meet at the ticket gate before the class reunion.