the foremost division or the front part of an army; advance guard; van.

the forefront in any movement, field, activity, or the like.

the leaders of any intellectual or political movement.

( initial capital letter ) Rocketry . a U.S. three-stage, satellite-launching rocket, the first two stages powered by liquid-propellant engines and the third by a solid-propellant engine.

noun

forefront , front , lead , leaders , leading