HinKhoj Dictionary

pro forma: प्रारूप (as a matter of form)
pro rata: यथानुपात (in proportion)
quid pro quo: मुआवज़ा/ बदले में (something that is given or done in exchange for something else)
raison d'etre: उद्देश्य/ अस्तित्व का कारण (reason something exists or is done)