D defs.my
Entry 1 sense Webster, 1913

Accompaniment

/(-ment)/ · Ac·com·pa·ni·ment · IPA /əˈkʌm.pə.ni.mənt/
01 n. That which accompanies; something that attends as a circumstance, or which is added to give greater completeness to the principal thing, or…
  1. 1.
    That which accompanies; something that attends as a circumstance, or which is added to give greater completeness to the principal thing, or by way of ornament, or for the sake of symmetry.(Mus.)