1. Refer to or discuss briefly
   "The speaker touched on several important topics"; "The report touched on the main issues without going into detail"
    
2. Be relevant to
   "His speech touched on several important issues";
   - refer, pertain, relate, concern, bear on, touch, have to do with
    
3. Come close to or reach (a level or condition)
   "Temperatures touched on freezing"

Derived forms: touched on, touching on, touches on

Type of: advert [rare], bring up, cite, mention, name, refer