1. a person from a flat or low-lying region, especially the plains or midwest of the United States
Usage: informal; sometimes used by mountain or coastal residents
2. a person unfamiliar with mountains or hilly terrain; someone unaccustomed to elevation changes
Usage: informal; often used in mountainous regions

Examples

• The flatlander struggled with the steep mountain trails on her first hiking trip.
• As a flatlander from Kansas, he found the Colorado Rockies breathtaking.
• The locals joked that the flatlanders couldn't handle the altitude.
• She moved from the plains and was proud to no longer be called a flatlander.
• The ski resort was full of flatlanders learning to navigate the slopes.
• Growing up in Nebraska made him a flatlander, but he eventually moved to the mountains.