Copious, plentiful (8)
I believe the answer is:
abundant
I believe this is a double definition.
'copious' is the first definition.
(similar in meaning)
'plentiful' is the second definition.
(similar in meaning)
(Other definitions for abundant that I've seen before include "Present in large quantities" , "In plentiful supply" , "well-provided" , "Present in great quantity" , "Bountiful" .)