Usually (2,1,4)
'usually' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for as a rule that I've seen before include "In most cases" , "Usually, in the normal course" , "Under normal circumstances" , "Mainly" , "Usually but not always" .)
'usually' is the definition.
(I know that usually can be written as normally)
This is all the clue.
(Other definitions for normally that I've seen before include "By and large" , "As a general rule" , "Ordinarily, usually" , "In the ordinary or typical way" , "In the usual or average situation" .)
'usually' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for commonly that I've seen before include "Usually, normally" , "What's very often" , "Usually, ordinarily" , "in a plebeian manner?" , "Not how the aristocracy behave" .)
'usually' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for generally that I've seen before include "as usual" , "In most cases, as a general rule" , "Usually, as a rule" , "most of the time" , "In most cases, usually" .)