Source: Online Etymology Dictionary
1340, "unintelligible talk, gibberish," from O.Fr. jargon "a chattering" (of birds), ultimately of echoic origin (cf. L. garrire "to chatter,"
Example of jargon
O.E. haldan (Anglian), healdan (W.Saxon), class VII strong verb (past tense heold, pp. healden), from P.Gmc. *khaldanan (cf. O.N. halda, Du. houden,
1655, from Gk. esoterikos "belonging to an inner circle," from esotero, comp. adv. of eso "within." In
Example of esoteric
1642 (implied in theosophical), "knowledge about God and nature obtained through mystical study," from M.L. theosophia (c.880), from Late Gk. theosophia (c.500, Pseudo-Dionysus) "wisdom concerning God or things divine," from Gk. theosophos "one wise about God," from theos "god" + sophos "wise, learned." Taken as the name of a modern philosophical system (sometimes called Esoteric Buddhism), founded in
1576 (n.) "confusion, intricacies," from L. meander, from Gk. Maiandros, name of a river in
"to wander about aimlessly," c.1746, earlier "to mumble, grumble" (1621), both senses probably from freq. of maund "to beg" (1567), from Fr. mendier "to beg," from L. mendicare.
1474, from L. mendicantem (nom. mendicans) "beggar," prp. of mendicare "to beg," from mendicus "beggar," originally "cripple" (connection via cripples who beg), from menda "fault, physical defect". Earlier form in M.E. was mendinant (1362), from O.Fr. mendinant, prp. of mendiner "to beg," from the same L. source.
1616, from M.Fr. mendacieux, from L. mendacium "a lie," from mendax (gen. mendacis) "lying, deceitful," related to menda "fault, defect, carelessness in writing" (cf. amend, mendicant), from PIE base *mend- "physical defect, fault." The sense evolution of mendax influenced by mentiri "to speak falsely, lie, deceive." Mendacity is attested from 1646.