In Book I of Principia, Newton opened with definitions and the three laws of motion now known as Newton's laws (laws of inertia, action and reaction, and acceleration proportional to force). Book II presented Newton's new scientific philosophy which came to replace Cartesianism.
Spanish has so many different words for beautiful: linda, bella, hermosa, guapa, just to name a few.
So, the most beautiful word must mean something beautiful (truthfully). I turned to another poet, George Oppen, who wrote: Clarity, clarity, surely clarity is the most beautiful thing in the world. A word that means brilliancy, splendor, and clearness of color, atmosphere, sight, intellect, judgment, conscience, style.