set (a boat) in motion by pushing it or allowing it to roll into the water

the town's lifeboat was launched to rescue the fishermen

start or set in motion (an activity or enterprise)

the government is to launch a £1.25 million publicity campaign

an act or instance of launching something

the launch of a new campaign against drinking and driving

a large motorboat, used especially for short trips

she cruised the waterways on a luxury motor launch

a police launch halted a small boat