GMAT Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 183 diatribe (n) A bitter or malicious criticism dichotomy (n) a division into two parts or kinds dictum (n) A positive utterance didactic (adj) Pertaining to teaching difference (n) Dissimilarity in any respect differentia (n) Any essential characteristic of a species by reason of which it differs from other species differential (adj) Distinctive differentiate (v) To acquire a distinct and separate character