To place elements in deliberate relation — in time (a sequence), in space (a composition). The conductor's verb.
Old French arengier (to put in a row), from a- (to) + rengier (to range), from renc (a rank, a row), of Frankish origin; to place elements in deliberate relation.
A placing of elements in deliberate relation, whether in time as a sequence or in space as a composition.