Lowercase prepositions, regardless of length, except when they are used adverbially or adjectivally (up in Look Up; down in Turn Down; on in The On Button; to in Come To, etc.) or when they compose part of a Latin expression used adjectivally or adverbially (A Priori, De Facto, In Vitro, etc.).
How do you write de facto?
Occasionally, you might see de facto written with a hyphen between the two words (de-facto). However, this hyphen is unnecessary. Should you write de facto with italics? Not unless you're trying to make the words stand out for some reason (as we are in some places in this article).
How do you use de facto in a sentence?
De facto in a Sentence ?
- Although Jim and Sarah have never married, they consider their thirty-year relationship to be a de facto marriage.
- The wife is usually the de facto head of the household.
- When the dictator was removed from power, a de facto government immediately fell into place.
