Definition of: pioneer

(pī′ə·nir′) noun
1. One of the first explorers, settlers, or colonists of a new country or region.
2. One of the first investigators or developers in a new field of research, enterprise, etc.
3. Mil. An engineer who goes before the main body building roads, bridges, etc. See synonyms under HERALD.
—v.t.
1. To prepare (a way, etc.).
2. To prepare the way for.
3. To be a pioneer of.
—v.i.
4. To act as a pioneer. [<F pionnier <OF paonier, orig. a foot soldier <peon, pion]