vanguard
Concise Oxford English Dictionary © 2008 Oxford University Press:
vanguard/ˈvanɡɑːd/
▶noun
- 1 the foremost part of an advancing army or naval force.
- 2 a group of people leading the way in new developments or ideas.
■ a position at the forefront of developments or ideas.
– origin ME shortening of OFr. avan(t)garde, from avant ‘before’ + garde ‘guard’.
'vanguard' also found in these Oxford entries:

