Two Latin phrases commonly used today . persona non grata : someone unwelcome due to ideological differences . Something of a quantified value is traded for something of equal value ; elements are parted and parceled off until quid pro quo is achieved . Quid pro quo refers to a profession or trade . Sui est refers to something so new or unusual it defies categorization .
Two Latin phrases commonly used today . persona non grata : someone unwelcome due to ideological differences . Quid pro quo refers to a profession or trade . Sui est refers to something so new or unusual it defies categorization .