Aviation refers to flying using aircraft, machines designed by humans for atmospheric flight. More generally, the term also describes the activities, industries, and regulatory bodies associated with aircraft.

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A day (symbol: d) is a unit of time equivalent to 24 hours. It is not an SI unit but it is accepted for use with SI. The SI unit of time is the second. The term comes from the Old English dg, with similar terms common in all other Indo-European languages, such as dies in Latin and dive in Sanskrit.

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