(n.) A part performed by instruments, accompanying another part or parts performed by voices; the subordinate part, or parts, accompanying the voice or a principal instrument; also, the harmony of a figured bass.
(n.) 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.
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Webster, Noah. Entry for 'Accompaniment'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/accompaniment.html. 1828.