Ad infinitum
'ad infinitum' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for on and on that I've seen before include "Incessantly" , "At tedious length" , "Unceasingly" , "Continuing or continually" , "Ever" .)
'ad infinitum' is the definition.
(I've seen this in another clue)
This is all the clue.