5 Latin expressions you should know

1. De Facto

De facto is a Latin expression that means "actual" (if used as an adjective) or "in practice" (if used as an adverb). In legal terms, de facto is commonly used in contrast to de jure, which means "by law." Something, therefore, can emerge either de facto (by practice) or de jure (by law).

And what of the plastic red bench, which has served as his de facto home for the last 15 years and must by now be a collector's item? (NY Times)

2. Status quo

This famous Latin expression means "the current or existing state of affairs." If something changes the status quo, it is changing the way things presently are.

Bush believes that the status quo — the presence in a sovereign country of a militant group with missiles capable of hitting a U.S. ally — is unacceptable. (Washington Post)

3. Per se

Per se is a Latin expression that means "by itself" or "intrinsically."

The mistake it made with the Xbox is that there is no game console market per se; there are PlayStation, GameCube, and Xbox markets. (PCMag.com)

4. Ad hoc

Ad hoc, borrowed from the Latin, can be used both as an adjective, where it means "formed or created with a specific purpose," and as an adverb, where it means "for the specific purpose or situation."

The World Bank's board on Friday ordered an ad hoc group to discuss the fate of President Paul Wolfowitz (CNN)

5. Sic

Sic is a Latin word meaning "thus", "so", or "just as that". In writing, it is placed within square brackets and usually italicized -- [sic] -- to indicate that an incorrect or unusual spelling, phrase, punctuation, and/or other preceding quoted material has been reproduced verbatim from the quoted original and is not a transcription error.

Warehouse has been around for 30 years and has 263 stores, suggesting a large fan base. The chain sums up its appeal thus: "styley [sic], confident, sexy, glamorous, edgy, clean and individual, with it's [sic] finger on the fashion pulse." (The Times)

source: http://www.dailywritingtips.com/6-foreign-expressions-you-should-know/ & http://en.wikipedia.org/wiki/Sic!