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A quadrilateral is a flat shape with four straight sides. A square is one. A is one. A diamond shape is one. The four sides do not have to be the same length, and the corners do not have to be square — four straight sides is enough. It is a maths-class word. You can also use it as an adjective: “a quadrilateral shape.” In the news, a meeting of four countries is sometimes called a quadrilateral too, because it has four “sides.” For school, the shape is the meaning that matters.
四邊形
組成A learned borrowing from New Latin quadrilaterus + -al: quadri- (“four”) + laterus (“sided,” from latus, “side”).
同家族的字
- lateralthe “side” piece
- bilateralshares -lateral, “sided”
- multilateralshares -lateral, “sided”
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
quadrilateralnoun/ˌkwɒdɹɪˈlætəɹəl/
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geometrymathematicssciencesA polygon with four sides.
- Meronyms: angle, side; see also Thesaurus:polygon
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An area defended by four fortresses supporting each other.
- The Venetian quadrilateral comprised Mantua, Peschiera, Verona, and Legnano.
quadrilateraladj/ˌkwɒdɹɪˈlætəɹəl/
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Having four sides.
- They spoke at a quadrilateral meeting of the trade ministers of the United States, the European Union, Canada, and Japan.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。