An Etymological Dictionary of Astronomy and Astrophysics

A representation of a real number between 0 and 1, as written a = d₁d₂d₃ …, where each d_i is one of the digits 0, 1, 2, …, 9. This means that a = d₁ x 10^-1 + d₂ x 10^-2 + d₃ x 10^-3+ …

See also: → decimal; → representation.