Etymology: First attested in w:1553, 1553 when it originally meant a "boisterous boy", later in w:1579, 1579 when it came to mean an "immodest woman", and then finally in w:1592, 1592 it developed its modern meaning of a "girl who acts like a boy"; from Tom, familiar form of Thomas + boy, "male child".
- A girl who behaves in a typically boyish manner.
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Full Definition of tomboy