n. One who goes before, as into the wilderness, preparing the way for others to follown. A person who is first or among the earliest in any field of inquiry, enterprise, or progressn. A soldier detailed or employed to form roads, dig trenches, and make bridges, as an army advances; a sapper.n. A member of any of several European organizations advocating abstinence from alcohol.n. 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.v. To go before and prepare or open a way for; to act as pioneer.