the GNU version of the Collaborative International Dictionary of English
n. The note next above the keynote; the second of the scale.
The Century Dictionary and Cyclopedia
n. In music, the tone in a scale next above the tonic or keynote; the second, as A in the scale of G.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. (music) the second note of a diatonic scale
Word Usage
"In this respect Palestrina's later style is apparent; but in harmonic terms he is still under Josquin's influence in, for instance, regularly using the minor supertonic triad even when it is leading to the dominant chord."