Abbott-Smith Manual Greek Lexicon
πιθανολογία (G4086)
1 * πιθανολογία , -ας, ἡ ( πιθανός , persuasive , plausible ), in cl. (Plat), the use of probable arguments , as opp. to demonstration ( ἀπόδειξις ); hence, persuasive speech : Col 2:4 (v. ICC , in l.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain