Phi Beta Kappa
Concise Oxford English Dictionary © 2008 Oxford University Press:
Phi Beta Kappa /ˌfʌɪˌbiːtə ˈkapə/
▶noun (in the US) an honorary society of undergraduates and some graduates, to which members are elected on the basis of high academic achievement.
■ a member of this society.
– origin from the initial letters of a Greek motto philosophia biou kubernētēs ‘philosophy is the guide to life’.
'Phi Beta Kappa' also found in these Oxford entries:

