1. the sport or activity of climbing mountains, especially high or difficult peaks
Usage: typically uncountable; often involves specialized equipment and training

Examples

• She has been mountaineering in the Alps for over a decade.
• Mountaineering requires physical fitness, technical skill, and mental toughness.
• The club organizes mountaineering expeditions every summer.
• He took a mountaineering course before attempting Mount Kilimanjaro.
• Mountaineering can be dangerous if proper safety precautions are not followed.
• Professional mountaineers often spend months preparing for high-altitude mountaineering.
• The documentary followed a team of mountaineers on their mountaineering journey to Everest.