Another word for optimal

Surpassing all others in quality:
best, optimum, superlative, unsurpassed. See better
Roget's II: The New Thesaurus Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
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"optimal." YourDictionary, n.d. Web. 21 January 2019. <https://thesaurus.yourdictionary.com/OPTIMAL>.
APA Style
optimal. (n.d.). Retrieved January 21st, 2019, from https://thesaurus.yourdictionary.com/OPTIMAL