Inductive bias refers to your suspicion that if the sun has risen for the last billion days in a row, then it may rise tomorrow as well. Since it is logically possible that the laws of physics will arbitrarily cease to work and that the sun will not rise tomorrow, coming to this conclusion requires an inductively biased prior.
L. Hamel. GECCO 2002: Proceedings of the Genetic and
Evolutionary Computation Conference, Seite 748--755. New York, Morgan Kaufmann Publishers, (9-13 July 2002)