twin [ˈtwɪn]

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¹ twin noun

• either one of two babies that are born at the same time to the same mother
• either one of two similar things that form a pair

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² twin adjective

• —used to describe children who are twins
• made up of two similar things that are used together
• forming one of a pair of related or connected ideas or places

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³ twin verb

• to bring (two things) together in close association—usually used as (be) twinned
• to form a relationship between (two towns in two countries)—usually used as (be) twinned