Hiker/ˈhaɪkər/ Definition 1 of 1Pro Tip 1/3Context Usage Use 'hiker' for people who enjoy walking as a leisure activity, especially in nature. They became hikers to appreciate nature more intimately. Pro Tip 2/3Activity Type 'Hiker' implies a recreational activity, not a professional or commuting walk. She's a hiker, not a courier; she walks for fun. Pro Tip 3/3Not Casual A 'hiker' usually takes long walks; it's more than just a casual stroll. The group became true hikers after completing the 20-mile trail.