One of two children or animals born at the same birth. The twins were inseparable and did everything together.
Either of two similar or identical things. The building had a twin on the opposite side of the street.
A person or thing that exactly resembles another. She found a twin of her favorite dress in a different color.
A crystal or grain composed of two parts that are symmetrical with respect to a plane or axis, formed during the growth process. Under polarized light the quartz twin was clearly visible.
To bring together or associate closely. The two cities decided to twin in order to promote cultural exchange.
To form a pair or couple. The dancers twinned perfectly during their performance.
To duplicate or match exactly. The designer twinned the fabric patterns for a seamless look.
(of an animal) to give birth to twins. The ewe twinned twice last season, producing four healthy lambs.