Webster's English Dictionary

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accompaniment

ac.com.pa.ni.ment \*-'k*mp-(*-)ne--m*nt\ n 1: a subordinate instrumental or 
   vocal part designed to support or compleme nt a principal voice or 
   instrument 2: an addition (as an ornament) intended to give completeness or 
   symmetry :: COMPLEMENT 3: an accompanying situation or occurrence : 
   CONCOMITANT