What is fairest of them all meaning?

The phrase "fairest of them all" is most commonly associated with the character of Snow White in the classic fairy tale. In the story, the Evil Queen asks her magic mirror who the most beautiful woman in the land is, and is unhappy when the mirror tells her it is Snow White. From then on, the queen becomes obsessed with killing Snow White and remaining the most beautiful.

The term "fairest of them all" generally refers to someone who is considered the most beautiful or handsome among a group of people. It can also be interpreted more broadly to mean the most admirable or virtuous person in a given context.