1) to boast one's self
2) a self display, employing rhetorical embellishments in extolling one's self excessively
Part of Speech: verb
Citing in TDNT: 6:93, 833
Middle voice from πέρπερος perperos (braggart; perhaps by reduplication of the base of G4008); to boast: - vaunt itself.
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 περπερεύομαι; click on the second column to search for that grammatical form of the root περπερεύομαι; click on the third column to search for that word and grammatical form; click on the total to search for the root περπερεύομαι.