  The contextual fraction introduced by Abramsky and Brandenburger defines a
quantitative measure of contextuality associated with empirical models, i.e.
tables of probabilities of measurement outcomes in experimental scenarios. In
this paper we define a measure of entanglement relying on the contextual
fraction. We first show that any separable state is necessarily non-contextual,
regardless of the measurement scenario. Then, for bipartite states we associate
a distinguished empirical model and show that the corresponding contextual
fraction is positively correlated with the entanglement entropy of the state,
suggesting that contextuality may be regarded as a refinement of entanglement.
