The phrase "new raid" refers to a newly designed challenge or mission in a video game, typically involving a group of players working together to complete difficult objectives and defeat powerful enemies. Full definition
There's also new missions, new strikes, new raid content, new free - roam activities and a world quest to complete. (alphr.com)
Destiny's most beloved activities got a brand new addition in the form of Spire of Stars, a brand new raid lair that truly tests team communication and abilities. (goombastomp.com)
As compiled by The Silph Road, below is the full list of new Raid bosses for Pokémon GO, divided into tiers: (techtimes.com)