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• One, the first natural number.
• The natural or usual or smallest measure of something, of which there are multiple s and of which there may be fractions.
• In most physical contexts, for example science and engineering, 'unit' is used to mean a physical unit of measurement of a quantity. Systems of units are formed which are typically characterized by the units chosen for mass, distance, and time. Such systems of units include
  • SI (previously known as the Metre-Kilogram-Second system of units (MKS)), the most commonly used units worldwide
  • Centimeter-Gram-Second (CGS) system of units, derived from SI and also commonly used worldwide; also one of two standard unit systems in astronomy
  • Metre-Tonne-Second system of units (MTS), little used
  • Imperial units, also known as British units, were historically used in Britain and its CommonwealthThe Commonwealth of Nations is a voluntary association of independent sovereign states, mostly formed by the United Kingdom and its former colonies. It was formerly known as the British Commonwealth (or British Commonwealth of Nations , and many still cal, and are similar (but not identical) to the current day US customary units
  • U.S. customary unitscustomary units (more commonly known in the US as English units or standard units are the non-metric units of measurement that are presently used in the United States, in some cases alongside the metric system of units. This system of units is similar to, primarily used in the USAThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in
  • Chinese system of units, used primarily in China
• A currencyFor exchange rates, see here. A currency is a unit of exchange, facilitating the transfer of goods and services. It is a form of money, where money is defined as a medium of exchange rather than e. a store of value. A currency zone is a country or region is a unit of moneyGeneral definition of money Money is an agreement, between a community, to use something as a medium of exchange, which acts as an intermediary market good. It can be traded and exchanged for other goods. The agreement can either be explicit or implicit, (a monetary unit).
• In mathematicsMathematics is commonly defined as the study of patterns of structure, change, and space; more informally, one might say it is the study of "figures and numbers". In the formalist view, it is the investigation of axiomatically defined abstract structures, "unit" often refers to the number one in some sense:
  • A unit vector is a vector with length 1.
  • The unit circle is the cirle with radius 1 centered at the origin of the coordinate system.
  • The unit interval is the interval of all real numbers between 0 and 1.
  • The imaginary unit of complex numbers is the number i, a number whose square is -1.
  • A root of unity is a complex number a power of which is 1.
  • A unit of a ring is an element of the ring that is invertible with respect to the ring multiplication.
• Military units:
  • Unit 101 was an Israeli special operations unit.
  • Unit 731 was a secret military unit of the Japanese army.
• Functional units are components of a system that perform a specific function:
  • The Central processing unit (CPU) is the processor of a computer; Arithmetic and Logical Unit, Control unit, Memory management unit and Floating Point Unit are important components of the CPU.
• A multiple unit is a passenger train whose carriages have their own motors.
• In the science fiction television series, " Doctor Who", the initials UNIT stand for the United Nations Intelligence Taskforce.
• In Australian rock music, Unit was the second album from the Brisbane band Regurgitator.