In the musical field, the adjectives 'major' and 'minor' can describe a scale, key, chord, or interval. For intervals, the terms refer to a difference in their relative width, major referring to notes somewhat further apart; the other terms are classifications based on the use of certain intervals, especially the major or minor third.
Major and minor are frequently referred to the titles of compositions in their foreign language form, especially in reference to the key of a piece of music.