E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Song of Degrees.
The fifteen Psalms, cxx. to cxxxiv.; so called because they are prophetic of the return or going up from captivity. Some think there is a connection between these Psalms and the fifteen steps of the Temple porch. (Ezekiel xl. 2226.) In the Revised Version called Song of Ascents.