|1.||the tendency to expect the best and see the best in all things|
|3.||the doctrine of the ultimate triumph of good over evil|
|4.||the philosophical doctrine that this is the best of all possible worlds|
|[C18: from French optimisme, from Latin optimus best, superlative of bonus good]|
"En termes de l'art, il l'appelle la raison du meilleur ou plus savamment encore, et Theologiquement autant que Géométriquement, le systême de l'Optimum, ou l'Optimisme." [Mémoires de Trévoux, Feb. 1737]Launched out of philosophical jargon and into currency by Voltaire's satire on it in "Candide." General sense of "belief that good ultimately will prevail in the world" first attested 1841 in Emerson; meaning "tendency to take a hopeful view of things" first recorded 1819 in Shelley.
optimismn. What a programmer is full of after fixing the last bug and before discovering the _next_ last bug. Fred Brooks's book "The Mythical Man-Month" (See "Brooks's Law") contains the following paragraph that describes this extremely well: