The definition of fidelity is faithful. In our field, we promote the idea of a higher sort of faithful called High Fidelity. In audio, we have different levels of fidelity: reasonable, good, and high. And that's what we write about and discuss on a continual basis: the level of faithfulness achieved by our systems. How true to the source? How faithful to the music? The next time you sit in judgment of your system consider whether it's merely faithful or if it's achieved a higher level worthy of the moniker. High Faithful doesn't have quite the same ring as High Fidelity but both get the job done.