1) to receive through another, anything left or bequeathed by him, to receive in succession, receive in turn, succeed to
Part of Speech: verb
From G1223 and G1209; to receive in turn, that is, (figuratively) succeed to: - come after.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root διαδέχομαι; click on the second column to search for that grammatical form of the root διαδέχομαι; click on the third column to search for that word and grammatical form; click on the total to search for the root διαδέχομαι.