Pronunciation: (pī"u-nēr'), [key]
1. a person who is among those who first enter or settle a region, thus opening it for occupation and development by others.
2. one who is first or among the earliest in any field of inquiry, enterprise, or progress: pioneers in cancer research.
3. one of a group of foot soldiers detailed to make roads, dig intrenchments, etc., in advance of the main body.
4. organism that successfully establishes itself in a barren area, thus starting an ecological cycle of life.
5. (cap.) of a series of U.S. space probes that explored the solar system and transmitted scientific information to earth.
6. (cap.) (formerly) a member of a Communist organization in the Soviet Union for children ranging in age from 10 to 16. Cf. Komsomol, Octobrist.

to act as a pioneer.

1. to be the first to open or prepare (a way, settlement, etc.).
2. to take part in the beginnings of; initiate: to pioneer an aid program.
3. to lead the way for (a group); guide.

1. being the earliest, original, first of a particular kind, etc.: a pioneer method of adult education.
2. of, pertaining to, or characteristic of pioneers: pioneer justice.
3. being a pioneer: a pioneer fur trader.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

pionPioneer Day
See also:


Related Content