van·guard

[van-gahrd]
noun
1.
the foremost division or the front part of an army; advance guard; van.
2.
the forefront in any movement, field, activity, or the like.
3.
the leaders of any intellectual or political movement.
4.
( 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.

Origin:
1480–90; earlier van(d)gard(e) < Middle French avangarde, variant of avant-garde; see avaunt, guard

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Vanguard is always a great word to know.
So is callithumpian. Does it mean:
a gadget; dingus; thingumbob.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
vanguard (ˈvænˌɡɑːd) [Click for IPA pronunciation guide]
 
n
1.  the leading division or units of a military force
2.  the leading position in any movement or field, or the people who occupy such a position: the vanguard of modern literature
 
[C15: from Old French avant-garde, from avant- fore- + gardeguard]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

vanguard
c.1450, vaunt garde, from M.Fr. avant-garde, from avant "in front" + garde "guard." Communist revolutionary sense is recorded from 1928.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He now wants to be seen at the vanguard of the mission to design a new
  financial system.
The animal kingdom's vanguard would have needed all the help it could get.
Still at the vanguard of number crunching, astronomers are nowadays more likely
  to be processing images than computing orbits.
With smart power, diplomacy will be the vanguard of our foreign policy.
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