📖 Definitions of "A.u."
noun
- 1
Initialism of arbitrary unit.
noun
- 1
Abbreviation of atomic units.
- 2
Abbreviation of absorbance units.
noun
- 1
A hypothetical world situated in a different dimension of space and time than the real world consisting of the universe known and experienced by human beings.
- 2
An imaginary realm, often a variant form of the real world, depicting a different way events could have unfolded or the universe could have functioned.
noun
- 1
A unit of length equal to 10−10 meters (that is, one ten-billionth of a meter), approximately the size of an atom, and denoted by the symbol Å, used especially to measure the wavelength of electromagnetic radiation or distances between atoms.
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