What is genetic equilibrium?

The Genetic equilibrium is the result of the Hardy-Weinberg law, a principle that affirms that under specific conditions the frequencies of the alleles of a gene in a given population remain constant.

(The Hardy-Weinberg principle isn't valid in the following conditions for populations too small, in the occurrence of noncasual (driven) crossings, for populations with many infertile members and in case of action of evolutionary factors, like natural selection, migrations and mutations.)