causa sine qua non

Latin noun phrase
cau·​sa si·​ne qua non | \ ˈkau̇-ˌsä-ˌsi-nā-kwä-ˈnōn How to pronounce causa sine qua non (audio) \

Definition of causa sine qua non

 (Entry 1 of 2)

: cause without which not : a necessary cause or condition

honoris causa

Latin phrase
ho·​no·​ris cau·​sa | \ hō-ˈnȯr-is-ˈkau̇-ˌsä How to pronounce honoris causa (audio) \

Definition of honoris causa (Entry 2 of 2)

: for the sake of honor : honorary used especially in names of academic degrees

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