■ noun
1》 a person who is the first to explore or settle a new country or area.
2》 an innovator or developer of new ideas or techniques.
3》 a member of an infantry group preparing roads or terrain for the main body of troops.
■ verb
1》 be a ~ of.
2》 open up (a road or terrain) as a ~.
Derivatives
~ing adjective
Origin
C16: from Fr. pionnier 'foot soldier, ~'.