A numeric relationship among production process inputs and production process outputs.
— Computer ScienceA way of describing chords generically using Roman numerals to describe which steps of the root note major scale are used to make up that chord. For example, a major chord uses the Roman numerals I, III, V. In the G major scale (G, A, B, C, D, E, F#, G) the I is the first note G, the III is the third note B, and the V is the fifth note D. This means that you would need the notes of G, B, and D in any order to make up the chord of G major.
— Guitar Learning