Definitions

1. noun

A word or phrase used to identify or distinguish people belonging to a particular group or category; a term used to indicate membership in a group or category.

“The phrase ‘I before E’ was once used as a shibboleth to distinguish English speakers from Dutch speakers.”

2. noun

Something that is a test or indicator of authenticity or genuineness.

“The quality of the music was the shibboleth of the band’s talent and artistry.”