Why so much Latin survives in everyday English
A large share of English vocabulary, especially legal, academic, and formal vocabulary, traces back to Latin β partly through Latin's role as the language of law, the church, and scholarship in Europe for centuries, and partly through Latin-derived French entering English after the Norman Conquest.
Legal writing kept an especially large dose of Latin
Fields like law and medicine held onto Latin terminology longer than everyday speech did, which is why phrases like "de facto," "prima facie," and "habeas corpus" still show up constantly in legal writing today.
Frequently Asked Questions
Do these phrases need to be italicized in writing?
Style guides vary. Some treat thoroughly naturalized phrases like 'et cetera' or 'vice versa' as ordinary English that no longer needs italics, while less common Latin terms are still often italicized. When in doubt, follow whatever style guide governs the document.
Is it wrong to use these phrases in casual conversation?
No β several of them, like 'quid pro quo' or 'status quo,' show up so often in everyday news and conversation that most people no longer think of them as foreign phrases at all.