They assume people will understand what "black tie" means.
They have also changed "semi-formal" (a ridiculous code I think) to something like "Smart...jacket required"
The new "spec"...
For a typical two week cruise there are normally four black tie evenings on board. However, when it is very hot, the number may be reduced.
Black tie nights on board are an opportunity for ladies to wear glamorous evening wear including cocktail dresses, ballgown or even a smart trouser suit. For men, a dinner jacket or tuxedo are the norm, but a dark lounge or business suit and tie can be worn as an alternative. You can also wear formal national dress. Attire for Black tie nights can be purchased on board.
Appropriate attire is essential for entry to the ship's bars and restaurants.
Smart, jacket required
Arcadia, Aurora, Adonia, Azura, Oceana and Oriana
For a typical two week cruise there are normally four Smart evenings.
Smart evenings give you the opportunity to wear a variety of stylish outfits. On Smart evenings ladies typically wear tailored trousers and separates or even a stylish dress, while men are in a shirt and trousers with a jacket, such as a blazer or sports jacket - or a suit and tie if they wish to.
Appropriate attire is essential for entry to the ship's bars and restaurants