e pluribus unum

ad absurdum [Latin] - to the point of absurdity.
ad infinitum [Latin] - to infinity. 
ad nauseam [Latin] - to a sickening degree.
aficionado [Spanish] - an enthusiastic fan.
a priori - [Latin] - based on theory rather than observation. 
au courant [Latin] - up-to-date. 
bona fide [Latin] - in good faith; genuine. 
carpe diem [Latin] - seize the day. 
carte blanche [French] - unrestricted power. 
caveat emptor [Latin] - let the buyer beware. 
de rigueur [Latin] - strictly required.
dolce vita [Italian] - sweet life.
e pluribus unum [Latin] - one out of many.
ex post facto [Latin] -  retroactively. 
faux pas [French] - a social blunder. 
glasnost [Russian] - open and frank discussion.
in loco parentis [Latin] - in the place of a parent. 
in situ [Latin] - situated in the original or natural position. 
ipso facto [Latin] - by the fact itself. 
mano a mano [Spanish] - directly or face-to-face.
modus operandi [Latin] - a method of operating. 
non sequitur [Latin] - it does not follow.
persona non grata [Latin] - unacceptable or unwelcome person.
pro bono [Latin] - done or donated without charge orfree.
quid pro quo [Latin] - something for something; an equal exchange.
semper fidelis [Latin] - always faithful.
terra incognita [Latin] - unknown territory. 
verboten [German] - forbidden.