noun
A person who is part of an advance guard, which is a group of people leading the way for an army or other group.
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The advance guardist led the team into the uncharted territory.
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The advance guardist was the first one to check out the new restaurant in town.
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The advance guardist was the ultimate trailblazer in the group.
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She was like the advance guardist of the fashion world, always ahead of the trends.