Everydayus Latin, pt. 1

Sunday
“Ad lib” means to improvise and perform spontaneously. The term is a shortening of “ad libitum,” or “according to pleasure.”
Monday
“Quid pro quo” means “something for something,” as in an exchange.
Tuesday
“Semper fi” is a shortening of “semper fidelis” or “always faithful,” and is the US Marine Corps’ motto.
Wednesday
“Vice versa” translates to “in a turned position,” but in modern English means interchanged or a switched position.
Thursday
“Per se” means “in itself” or “intrinsically” in English.
Friday
“Pro bono” shortens “pro bono publico” which means “for the public good” and usually refers to professional services (especially legal) offered for free.
Saturday
“E.g.” might appear before an example, since it stands for “exempli gratia” or “for the sake of example.”