Exclusion (9)
'exclusion' is the definition.
(I know that ostracism is a type of exclusion)
This is all the clue.
(Other definitions for ostracism that I've seen before include "Exclusion from a group or society" , "being sent to Coventry" , "Banishment" , "isolation" , "Shunning" .)
'exclusion' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for omission that I've seen before include "A thing left out" , "Exclusion" , "Something lacking" , "Failure to include" , "Something left out or not done" .)