noun
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One who goes before, as into the wilderness, preparing the way for others to follow.
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A person or other entity who is first or among the earliest in any field of inquiry, enterprise, or progress.
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(military) A soldier detailed or employed to form roads, dig trenches, and make bridges, as an army advances; a sapper.
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A member of any of several European organizations advocating abstinence from alcohol.
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(communism) A member of a children’s organization operated by the Communist Party, typically in the second of three stages toward becoming a member of the Party itself.
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(Singapore) Alternative letter-case form of Pioneer (“A Singaporean born on or before 31 December 1949, who is entitled to various healthcare and social support schemes.”)