Same dialect in translation (9)
I believe the answer is:
identical
'same' is the definition.
(similar in meaning)
'dialect in translation' is the wordplay.
'translation' indicates an anagram.
'dialect'+'in'='dialectin'
'dialectin' is an anagram of 'IDENTICAL'.
(Other definitions for identical that I've seen before include "Impossible to tell apart" , "Duplicate" , "lacking distinction" , "Like two peas in a pod" , "uniform" .)