(physics) Any one of several natural units in a system originally proposed by Max Planck based on universal constants. Symbols for Planck units are the symbol for the physical quantity with a subscript P.

plural of unit interval

(Australia, law) An amount, used as a basis of a penalty fine, which can be adjusted by the government without the need to pass new legislation.

(neurology) A neuron with its associated muscle fibres.

A unit of measurement of window frames, treating the combined width and height in inches as a single measure of length.

plural of united inch

plural of United Statian

(rare) A citizen or inhabitant of the United States.

(rare) Pertaining to the United States.

(number theory, complex analysis, quaternion theory) An imaginary number (in the case of complex numbers, usually denoted i) that is defined as a solution to the equation i²=-1.