1. a person who participates in or leads an expedition, especially to explore or conduct research in a remote or difficult region

Examples

• The expeditionist carefully documented the wildlife she encountered in the Amazon rainforest.
• Early expeditionists faced extreme hardship while mapping the Arctic regions.
• As a seasoned expeditionist, he had climbed mountains on five continents.
• The museum honored the expeditionists who discovered the ancient ruins.
• Young expeditionists trained for months before attempting the polar expedition.
• She became an expeditionist after reading accounts of famous explorers as a child.