IPA: /ˈprɛpɪnəs/
KK: /ˈprɛpɪnəs/
The quality or style of being fashionable and well-groomed, often associated with a certain social class or lifestyle.
Her preppiness was evident in her choice of clothing and accessories.
Preppiness is derived from "prep" (short for preparation, originating from the word "prepare" from Latin "praeparare", meaning to make ready) and the suffix "-ness" (meaning the state or quality of). The term refers to the state of being prepared or exhibiting characteristics associated with a preppy style.
Think of 'preparing' for something, which is what 'prep' means, and remember that 'preppiness' describes the quality of being stylishly ready or well-prepared.