In the perspective of European-descendent theory, the degrees of any key or scale (major, minor, or modal) can be classified as follows:
1 - Tonic
2 - Supertonic
3 - Mediant
4 - Subdominant
5 - Dominant
6 - Submediant
7 - Leading Tone
Let us take the case of C major as our key/scale:
C - Tonic
D - Supertonic
E - Mediant
F - Subdominant
G - Dominant
A - Submediant
B - Leading Tone
Similarily, this works in the minor keys, too. Using A natural harmonic as our key/scale:
A - Tonic
B - Supertonic
C - Mediant
D - Subdominant
E - Dominant
F - Submediant
G - Leading Tone
There's only one tonic in every scale. It's the first pitch played in the scale. In this case it's a C. Were it Bb major, the tonic would be Bb, D major the tonic would be D, etc..
Next time, include the scale in the question.
To change a major scale to a natural minor scale, lower the 3rd, 6th, and 7th scale degrees.
The E flat scale
The dominant note is the 5th note in the scale. In the B Major scale, F is the dominant note.
The tonic note of any diatonic scale is the first note (starting note) of the scale. In the case of G-flat major the tonic note is G-flat!
The tonic is the 1st note in the scale. For example, in the G major scale, G is the tonic.
The interval from the tonic note to the third note of a major scale is a major third.
The interval from the tonic note to the third note of a major scale is a major third.
1-3-5 of a major scale make up the tonic CHORD.
The tonic in any scale is the 1st scale degree. For example, in the key of F major, the tonic is F.
It is a major chord. Actually, tonic is simply defined as the first note in the scale or key. All chords have tonic note. The tonic of a C chord is the C. The tonic of a C minor chord is a C. The tonic of a C minor major 7 is a C.
The first note of the major scale is the tonic.
Ab Major
Each scale has a Leading Tone (which is the 7th note of the scale) and a Tonic Note (which is the first/eighth note of the scale). For the key of C major, the leading tone would be B, and the tonic note would be C.
There's only one tonic in every scale. It's the first pitch played in the scale. In this case it's a C. Were it Bb major, the tonic would be Bb, D major the tonic would be D, etc..
The first note of a major or minor scale is called the tonic note. For example: for C major, the first note (or tonic note) is C; for a minor, the first note (or tonic note) is a.