Twin
/twˈɪn/
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Definition
(noun) Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling.
Sentence Examples
I'd like a twin with an extra bed.
I can't tell one twin from the other.
CEFR Practice Quiz
She has a ____ sister who looks exactly like her, and they often confuse people who do not know them well today.