That which accompanies; accompaniment.
"The accompanying sheet music helped me learn the new song quickly."
"The accompanying music set a gentle mood for the dinner party."
present participle of accompany
"The accompanying music swelled as the choir began their performance."
In plain English: To accompany someone means to go with them somewhere as their partner or support.
"She decided to accompany her friend to the concert."
occurring with or following as a consequence
"an excessive growth of bureaucracy, with attendant problems"
"snags incidental to the changeover in management"
"attendant circumstances"
"the period of tension and consequent need for military preparedness"
"the ensuant response to his appeal"
"the resultant savings were considerable"
"collateral target damage from a bombing run"
Present together.
"The accompanying report was filed alongside the main application."