Common stock (5)
I believe the answer is:
usual
I believe this is a double definition.
'common' is the first definition.
(I know that common can be written as usual)
'stock' is the second definition.
(synonyms)
(Other definitions for usual that I've seen before include "Typically done" , "Normal, habitual" , "Expected" , "Accustomed" , "Typically occurring" .)