Normal uniform (7)
I believe the answer is:
regular
I believe this is a double definition.
'normal' is the first definition.
(synonyms)
'uniform' is the second definition.
(similar in meaning)
(Other definitions for regular that I've seen before include "Customary; done frequently" , "Recurring in a uniform manner, say pulse" , "Steady, in a fixed order" , "Frequent - usual" , "Steady, even" .)