What does "logarithmic" mean?

Logarithmic: Of or pertaining to logarithms; consisting of logarithms. Logarithmic curve (Math.), a curve which, referred to a system of rectangular coördinate axes, is such that the ordinate of any point will be the logarithm of its abscissa. -- Logarithmic spiral, a spiral curve such that radii drawn from its pole or eye at equal angles with each other are in continual proportion. See Spiral.