Inborn; normal (7)
I believe the answer is:
natural
I believe this is a double definition.
'inborn' is the first definition.
(similar in meaning)
'normal' is the second definition.
(similar in meaning)
(Other definitions for natural that I've seen before include "Genuine, unaffected" , "Unaffected - native" , "Unforced" , "Normal; off-white" , "(In music) neither sharp nor flat" .)