Last; maximum (8)
I believe the answer is:
ultimate
I believe this is a double definition.
'last' is the first definition.
(similar in meaning)
'maximum' is the second definition.
(I've seen this in another clue)
(Other definitions for ultimate that I've seen before include "The final point" , "Happening at the end of a process, final" , "Eventual" , "Best - last" , "Conclusive" .)