from the GNU version of the Collaborative International Dictionary of English
- adj. the major seventh note of any scale; -- so called because, being but a half step below the octave, or key tone, and naturally leading up to that, it makes the ear sensible of its approaching sound. Called also the leading tone.
Sorry, no etymologies found.
But Heinichen. in a very sensible note on this passage in Eusebius, while he admits that his long illness might produce a temporary depression of spirits, triumphantly appeals to the philosophical conduct of Diocletian in his retreat, and the influence which he still retained on public affairs. —