(UK, military, nautical, historical) Of a Royal Navy ship of the line in the Napoleonic Era: having 50–60 guns across two gun decks, a complement of 320–420, and weighing approximately 1,000 tons burthen.

(UK, military, nautical, historical) A fourth-rate ship of the line.

plural of fourth trimester

The right of an airline of one country to land in a different country and board passengers travelling to the airline’s own country.

(databases) A stage in the normalization of a relational database in which a database is in Boyce-Codd normal form and all multi-valued dependencies are functional dependencies.

(idiomatic, US) Demonstratively patriotic about the United States.

A logistics operation that uses third-party logistics services on behalf of its customers, rather than controlling a fleet of its own vehicles.

present participle of break the fourth wall

Third-person singular simple present indicative form of break the fourth wall

(idiomatic, fiction) To apparently communicate with reality directly, such as when characters of literature comment on the existence of a reader.