[1] : The Collaborative International Dictionary of English v.0.48

touch on \touch" on\, v. t.
   to mention briefly, or in passing.
   pjc

[2] : WordNet (r) 2.0

touch on
     v 1: refer to or discuss briefly
     2: have to do with or be relevant to; "there were lots of
        questions referring to her talk"; "my remark pertained to
        your earlier comments" syn: refer, pertain, relate,
         concern, come to, bear on, touch
     3: restore by replacing a part or putting together what is torn
        or broken; "she repaired her tv set"; "repair my shoes
        please" syn: repair, mend, fix, bushel, doctor,
         furbish up, restore ant: break
     4: have an effect upon; "will the new rules affect me?" syn: affect,
         impact, bear upon, bear on, touch
see also:
refer pertain relate concern come to bear on 
touch repair mend fix bushel 
doctor furbish up restore break affect 
impact bear upon 

Touch >> T Words
Touch, definition of term: Touch
touch_pag1.html

Touch Screen >> T Words
Touch Screen, definition of term: Touch Screen
touch+screen_pag1.html

Touch System >> T Words
Touch System, definition of term: Touch System
touch+system_pag1.html

Touch Off >> T Words
Touch Off, definition of term: Touch Off
touch+off_pag1.html

Touch Up >> T Words
Touch Up, definition of term: Touch Up
touch+up_pag1.html

Touch Base >> T Words
Touch Base, definition of term: Touch Base
touch+base_pag1.html

Touch Down >> T Words
Touch Down, definition of term: Touch Down
touch+down_pag1.html

In Touch >> I Words
In Touch, definition of term: In Touch
in+touch_pag1.html

Touch And Go >> T Words
Touch And Go, definition of term: Touch And Go
touch+and+go_pag1.html

Get In Touch >> G Words
Get In Touch, definition of term: Get In Touch
get+in+touch_pag1.html