Noun

(en noun)

One who goes before, as into the wilderness, preparing the way for others to follow.

A person or other entity who is first or among the earliest in any field of inquiry, enterprise, or progress.

* {{quote-magazine, date=2013-05-10

, author=Audrey Garric , title=Urban canopies let nature bloom , volume=188, issue=22, page=30 , magazine=(The Guardian Weekly) citation , passage=As towns continue to grow, replanting vegetation has become a form of urban utopia and green roofs are spreading fast. Last year 1m square metres of plant-covered roofing was built in France, as much as in the US, and 10 times more than in Germany, the pioneer in this field.}}

Some people will consider their national heroes to be pioneers of civilization.

Certain politicians can be considered as pioneers of reform.

(obsolete, military)   A soldier detailed or employed to form roads, dig trenches, and make bridges, as an army advances; a sapper.

A member of any of several European organizations advocating abstinence from alcohol.

(Communism)   A child of 10–16 years in the former Soviet Union, in the second of the three stages in becoming a member of the Communist Party.

Noun

(en noun)

That part of a country which fronts or faces another country or an unsettled region; the marches; the border, confine, or extreme part of a country, bordering on another country; the border of the settled and cultivated part of a country; as, the frontier of civilization.

* 1979 , Richard Elphic and Hermann Guilomee (editors), The shaping of South African Society, 1652 - 1820 , page 297:

Unlike a boundary, which evokes the image of a line on a map and demarcates spheres of political control, the frontier is an area where colonisation is taking place....no authority is recognised as legitimate by all parties or is able to excersise undisputed control over the area.

(obsolete) An outwork of a fortification.

* Shakespeare

Palisadoes, frontiers , parapets.