The Vietnamese word "kỷ lục" is a noun that means "record" in English. It is used to refer to an achievement that is the best or highest ever recorded in a particular category, such as sports, arts, or any other field.
In most contexts, "kỷ lục" specifically refers to records of achievement. However, in a more abstract sense, it can also refer to any notable mark or standard, but this usage is less common.