Not taken by (4)
I believe the answer is:
(Other definitions for onto that I've seen before include "(Moving) aboard" , "To a position on (something)" , "forward, with a destination" , "Conscious of" , "To the whole of (maths.)" .)
I believe the answer is:
(Other definitions for onto that I've seen before include "(Moving) aboard" , "To a position on (something)" , "forward, with a destination" , "Conscious of" , "To the whole of (maths.)" .)