The technical names of the degrees in a major scale are:

• Tonic: The first degree of the scale.
• Supertonic: The second degree of the scale.
• Mediant: The third degree of the scale.
• Subdominant: The fourth degree of the scale.
• Dominant: The fifth degree of the scale.
• Submediant: The sixth degree of the scale.
• Leading tone: The seventh degree of the scale.

These names are derived from the function of each degree in the scale. The tonic is the most stable degree of the scale and serves as a point of rest. The supertonic is a bit less stable than the tonic and often leads to the mediant. The mediant is the least stable degree of the scale and often leads to the dominant. The subdominant is a bit more stable than the mediant and often leads to the dominant. The dominant is the most unstable degree of the scale and often leads to the tonic. The submediant is a bit less stable than the dominant and often leads to the tonic. The leading tone is a half step below the tonic and creates a strong pull towards the tonic.
These technical names are used in music theory to analyze and discuss the structure of music.