Proportion is
a.
the all-encompassing reproduction of a person or thing.
b.
the relative size of an object as compared to another, or as compared to the other elements in the piece.
c.
the arrangement of visual elements in a piece, which to create understanding and convey the artist's message.
d.
the arrangement of elements in order to create equilibrium and a piece that is aesthetically pleasing.

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !