noun

twin

one of two children born at the same birth, a counterpart

He is an identical twin.

He is an identical twin.

My city has a twin in France.

My city has a twin in France.

((a twin)) one of two children born at the same birth He is an identical twin.

((a twin in/of sth.)) one of a pair of things that are the same or very similar My city has a twin in France.

Synonyms: double, counterpart, duplicate

From Old English 'twinn', meaning 'double' or 'twofold'. Related to the word 'two'.

A 'twin' is one of 'two'. The 'tw' sound at the beginning is a strong clue to its meaning.

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