The fastest time ever set for one lap around a particular racetrack or in a particular race.

(often plural) A ranking of music (songs, albums etc) according to popularity during a given period of time.

unofficial / secret

unofficially / secretly, in secret

(geology) The collective record of the development of the Earth that is reflected in the preserved rocks, especially sedimentary rocks, from throughout geological history.

(US) An album or single that has sold 500,000 or more copies.

(databases) part consisting of several uniquely named components called data fields in the database structure

(figuratively) A person who repeatedly says the same thing.

Any characteristic or accomplishment that exceeds all other instances of that characteristic or accomplishment. / (sports) The world's best score or time for a certain event.

(aviation/travel) The six-digit alphanumeric identifier of a PNR.