  We propose a universal language to assess macroscopic quantumness in terms of
coherence, with a set of conditions that should be satisfied by any measure of
macroscopic coherence. We link the framework to the resource theory of
asymmetry. We show that the quantum Fisher information gives a good measure of
macroscopic coherence, enabling a rigorous justification of a previously
proposed measure of macroscopicity. This picture lets us draw connections
between different measures of macroscopicity and evaluate them; we show that
another widely studied measure fails one of our criteria.
