Ecclesiastical mode and Musical mode

Ecclesiastical mode noun - Any of a system of modes used in Gregorian chants up until 1600; derived historically from the Greek mode.

Musical mode and ecclesiastical mode are semantically related. In some cases you can use "Musical mode" instead a noun phrase "Ecclesiastical mode".

Musical mode noun - Any of various fixed orders of the various diatonic notes within an octave.

Ecclesiastical mode and musical mode are semantically related. Sometimes you can replace phrase "Ecclesiastical mode" with "Musical mode", this phrases are similar.