IPA: //ˈprɛpi//
KK: /ˈprɛpi/
Describing a style or attitude that is neat, classic, and often associated with students from preparatory schools.
He wore a preppy outfit with a polo shirt and khakis to the party.
A person who dresses in a style associated with traditional preparatory schools, often characterized by neat and classic clothing.
She always wears polo shirts and khakis, looking very preppy at school.
Preppy is derived from the term 'preparatory' (from Latin 'praeparare', meaning to prepare), which refers to preparatory schools that prepare students for college. The suffix '-y' indicates a characteristic or quality. Thus, 'preppy' describes a style or attitude associated with students from these preparatory schools.
Think of 'preparatory' as a way to remember that 'preppy' relates to the style and attitude of students who are being 'prepared' for higher education.