the act of departing
"After spending the weekend at his parents' house, he was finally leaving for work on Monday morning."
present participle of leave
"After leaving the office early, I stopped by the bakery on my way home."
In plain English: Leaving means going away from a place or person and not coming back right now.
"The bus is leaving in five minutes, so you should hurry to the stop."
Usage: Use "leaving" to describe someone who is in the process of departing from a place or ending an activity. It functions as a continuous action or acts as an adjective modifying a noun, such as in "the leaving guests."
Derived from Old English læfan, meaning "to leave behind" or "to abandon," this form is the present participle of that verb. It retains the original sense of departing or remaining after someone else has gone.