Looks like a valuable resource. A bit surprised to see that in Building Secure and Reliable Systems, as far as I can tell the word reliable isn't given a preci

Looks like a valuable resource. A bit surprised to see that in Building Secure and Reliable Systems, as far as I can tell the word reliable isn't given a precise definition, even when it's contrasted with security. The preface opens with "Can a system ever truly be considered reliable if it isn’t fundamentally secure?" but the terms don't seem to be clarified anywhere. It appears not to mean the same thing as service availability, given the section on the CIA triad. Am I missing something terribly obvious?