WordWeb Online

1. Any long and difficult trip
    
2. A long walk usually for exercise or pleasure
   - hike, tramp, ramble
    
3. A journey by ox wagon (especially an organized migration by a group of settlers)

1. Journey on foot, especially in the mountains
   "We spent the summer trekking in the foothills of the Himalayas"
    
2. Make a long and difficult journey
   "They trekked towards the North Pole with sleds and skis"

Derived forms: trekked, trekking, treks

Type of: journey, journeying, travel, trip, walk

Encyclopedia: Trek