1640s, "willfully blind or tolerant," from Latin conniventem (nominative connivens), present participle of connivere "to wink," hence, "to wink at (a crime), be secretly privy" (see connive). In natural history, "having a gradually inward direction, gradually convergent," 1757.
"personal record of events, narrative of the facts or events of the life of a person or a phase of history written from personal knowledge or observation upon points about which the writer is specially informed," 1650s, plural of memoir.
Doctor Kearney, who formerly, with so much reputation, delivered lectures in this place on the history of Rome, observed to me once, that he was not an optimist, but an "agathist"; that he believed that every thing tended to good, but did not think himself competent to determine what was absolutely the best. The distinction is important, and seems to be fatal to the system of Optimism. [George Miller, "Lectures on the Philosophy of Modern History," Dublin, 1816]