Manner, method (4)
I believe the answer is:
mode
I believe this is a double definition.
'manner' is the first definition.
(synonyms)
'method' is the second definition.
(way of doing something)
(Other definitions for mode that I've seen before include "Form or style" , "Way of doing something" , "Manner of dome" , "Style; statistical value" , "Way of operating" .)