What does a += 1 mean?
When you say that something is 'A1/A one', you mean that it is excellent or first rate. The expression can be used with people as well. *The car is over ten years old, but the engine is in A1 condition. *As a teacher, Aishwarya is A1. Lloyd's, a British company that insured ships, coined the term. What does a plus 1 mean? Definition of plus-one: a person who accompanies an invited guest to an event or gathering at which guests are allowed to bring a companion or partner My husband twice received handsome engraved invitations to presidential dinners.