Definify.com
Webster 1913 Edition
Notionally
No′tion-al-ly
,adv.
 In mental apprehension; in conception; not in reality. 
Two faculties . . . 
notionally 
or really distinct. Norris.
Webster 1828 Edition
Notionally
NO'TIONALLY
,adv.
 Two faculties notionally or really distinct.