- 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.
- 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.
- the leading division or units of a military force
- the leading position in any movement or field, or the people who occupy such a position
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