Transitional (12)
'transitional' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for intermediate that I've seen before include "Coming between (eg, in size)" , "Coming between two things in some way" , "Act as agent" , "Lying between two extremes" .)
(Other definitions for interim that I've seen before include "Meantime; temporary" , "Meantime - provisional" , "An intervening period of time" , "Stopgap" , "Meanwhile" .)