a traditional British ceremony held every year in London on the official birthday of the Queen or King. Many soldiers on horses or on foot, march across Horse Guards Parade carrying their 'colours' (=flags), and theysalute the queen or king as they march past. It is a very colourful ceremony and is popular especially with tourists.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
Dictionary pictures of the day
Do you know what each of these is called?
Click on any of the pictures above to find out what it is called.