De facto
actual, in practice, it is a situation in which is true but has not been legally recognized or accepted in general
Status quo
the current or existing state of affairs, the existing condition, the state or condition in which a thing is existing
Per se
by itself in itself or intrinsically, used to refer to a particular thing on its own
Cul-de-sac
bottom of sack, a dead end street, used to express an action that leads to nowhere or an impasse
Vis-a-Vis
face to face, compared with or in relation to
Ad hoc
for this, formed or created with a specific purpose, for a specific purpose or situation
Carte blanche
unlimited authority
Bona fide
good faith, real or genuine
Faux pas
a social blunder
Ipso facto
by the fact itself, really
Modus operandi
method of operating
Persona non grata
an unacceptable person
Prima donna
a temperamental and conceited person
Pro bono
done or donated without charge
Quid pro quo
something for something, usually an equal exchange, something given or taken as equivalent to another
Caveat emptor
let the buyer beware
Ad nauseam
to a sickening degree
Bon voyage
have a nice trip
En masse
in a large group
Fait accompli
established fact, a thing already done
Ad infinitum
up to infinity
Ad valorem
according to value
Coup de hazard
a lucky chance
Dei gratia
by the grace of god