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1. Fermat's principle of least time: Wiktionary

Definitions from Wiktionary (Fermat's principle of least time) ▸ noun:  Synonym of Fermat's principle ▸ Words similar to fermat's principle of least time ▸ Usage examples for fermat's principle of least time ▸ Idioms related to fermat's principle of least time ▸ Wikipedia articles (New!) ▸ Words that often appear near fermat's principle of least time ▸ Rhymes of fermat's principle of least time ▸ Invented words related to fermat's principle of least time