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Alethea [Alethea 词源字典]: fem. proper name, from Greek aletheia "truth, truthfulness," from alethes "true," literally "not concealing," from privative prefix a- "not" (see a- (3)) + lethe "forgetfulness, oblivion" (see latent).[Alethea etymology, Alethea origin, 英语词源]
alethic: "Denoting modalities of truth, such as necessity, contingency, or impossibility", 1950s: from Greek alētheia 'truth' + -ic.
alethiology: "The study of truth; that part of logic or philosophy which deals with the nature of truth", Mid 19th cent.; earliest use found in Henry Longueville Mansel (1820–1871), dean of St Paul's and theologian. From post-classical Latin alethiologia (1764, after German Alethiologie ( J. H. Lambert Neues Organon) from post-classical Latin alethia (late 2nd or early 3rd cent. in Tertullian) or its etymon ancient Greek ἀλήθεια truth (from ἀληθής true + -εία) + post-classical Latin -ologia.