Suppose it means adopt (6)
I believe the answer is:
assume
I believe this is a double definition.
'suppose' is the first definition.
(assume can mean to suppose or expect)
'adopt' is the second definition.
(I know that adopt can be written as assume)
'it means' is the link.
(Other definitions for assume that I've seen before include "Take (control)" , "Adopt falsely" , "Suppose; put on" , "Believe" , "Claim without justification" .)