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From Biology-Online Dictionary | Biology-Online Dictionary
1. (Science: psychology) The opinion or doctrine that everything in nature, being the work of god, is ordered for the best, or that the ordering of things in the universe is such as to produce the highest good.
2. A disposition to take the most hopeful view; opposed to pessimism.
Origin: L. Optimus the best; akin to optio choice: cf. F. Optimisme. See Option.