departure of a vehicle
Example sentences
発車まであと５分しかないのに、彼女は姿を見せないわ。
There are only five minutes till the train starts, and she hasn't appeared.
発車ホームはどちらですか。
Which is the departure platform?
次のバスの発車時刻を確かめたほうがいいよ。
You would do well to make sure when the next bus starts.