IPA: /kwɪnˈtɛsənʃəl/
KK: /kwɪnˈtɛsənʃəl/
Being the most perfect or typical example of something; representing the essence of a particular quality or type.
She is the quintessential artist, always expressing her emotions through her work.
Quintessential → It is formed from "quint-" (from Latin "quintus", meaning fifth) and "essentia" (meaning essence). The word refers to the fifth element, which was believed to be the essence of all things, thus describing something that is the most perfect or typical example of a quality or class.
Think of the 'fifth element' ('quint-') representing the purest form of something ('essentia') — that's why quintessential means the perfect example of a quality.