出発 means "departure" or "departing." It refers to the act of leaving a place to go somewhere else. It's often used for travel, like trains, planes, or even just leaving home. For example, "午前8時に出発します" means "I will depart at 8 AM."

ある場所から別の場所へ向かって出発すること。「東京を出発する」のように使います。