A part corresponding to another part; anything which answers, or corresponds, to another; a copy; a duplicate; a facsimile.
One of two corresponding copies of an instrument; a duplicate.
A person who closely resembles another.
A thing may be applied to another thing so as to fit perfectly, as a seal to its impression; hence, a thing which is adapted to another thing, or which supplements it; that which serves to complete or complement anything; hence, a person or thing having qualities lacking in another; an opposite.
Grade 9: I was too small for football, too shy for drama class, but I did have a passion for music. And so, with a mouth full of braces (and a glorious mullet), I accepted that the trombone would be a fantastic scholastic counterpart to my extracurricular loves: country music, and the guitar. Jason McCoy
Mozart would play a counterpart with his left hand while using his right to mock it. It was blue, dark, shadowy - and it made me feel something. That's when I realized music was inside me. Alicia Keys
When you do a thing with your whole soul and everything that is noble within you, you always find your counterpart. Camille Pissarro
Until we command the exact same salary as every male counterpart, I feel a political desire to stand by other women. If we don't stand together, that equality will never be fully realized, and that bothers me. Shirley Manson