Earlier quoted context omitted.
I'm not certain that this is exactly what you're talking about, but one of my dictionaries (Webster's New International, 1916) includes this under the entry for Authentic, which brings me great joy: Authentic, Genuine. The prevailing sense of authentic is authoritative, trustworthy, with the implication of accordance with fact; as "confirmed both by legend and authentic record" (Froude); "assurances more or less auth…
Wow! I'd be fascinated how many person-hours went into that entry. On the whole, Wikipedia et al. are improvements in comprehensiveness and timeliness, but god damn do the gems of prior methods still shine brightly.
Here's one more entry, on synonyms of Intention:
Intention, Intent, Purpose, Design, Aim, Object, End are here compared in their general senses; for technical definitions, see defs. Intention, which often suggests little more than what one means or proposes to do, implies less settled determination than Purpose, less definite plan or prearrangment than Design, which frequently adds the implication of crafty or artful scheming; as "She had not had an intention or a thought of going home, until she had announced it to him as a settled design" (Dickens); his intentions are good; cf. to declare one's intentions; "My purpose holds to sail beyond the sunset, and the baths of all the western stars, until I die" (Tennyson); "I go amongst the buildings of a city and I see a man hurrying along - to what? The creature has a purpose and his eyes are bright with it" (Keats); "envious commands, invented design to keep them low" (Milton); "Should he find me here, [he] would discover my name, and perhaps my designs, to the rest of the family" (Goldsmith); cf. "designing lovers" (id.). Intent is chiefly legal or poetical; as, intent to deceive, kill; "the power of a sublime intent" (Shelley). Aim emphasizes directness of purpose, Object that on which activities are focused, End that towards which they tend as their consequence or final cause; as, "to [his trust] keeps faithful with a singleness of aim" (Wordsworth); "her steadiness and courage in the pursuit of her aims" (J.R. Green); "Yet in the task of luxury of freedom I began to wish for the daily task, the active pursuit, which gave a value to every book, and an object to every inquiry" (Gibbon); the object of education, a man without an object in life; "I see in part that all, as in some piece of art, is toil cooperant to an end" (Tennyson); "Man's chief end is to glorify God and to enjoy him forever" (Westminster Catechism). See Cause, Effect, Plan, Voluntary.
You may also be interested in Garner's Modern American Usage. David Foster Wallace, in reviewing this book for Harper's, wrote "He's both a lawyer and a lexicographer (which seems a bit like being both a narcotics dealer and a DEA agent)".