四角|しかくshikaku[0]heiban (flat)

1. na-adjective, no-adjective, geometryquadrilateral; square
   箱ばこの形かたちは普通ふつう四角しかくです。↗

   The shape of a box is usually square.

• SynonymスクエアNeutralLoanword for a square or an open plaza, mostly in names like 「タイムズスクエア」; in everyday speech, 「四角」 is the usual word.
• Synonym真四角ましかくNeutralA perfectly square shape; stronger than 「四角」, stressing that all four sides are equal.
• Synonym四角いしかくいNeutralThe adjective form: square or rectangular, as in 「四角い顔」. 「四角」 itself is a noun or na-adjective.
• Antonym丸まるNeutralA circle, the opposite of square 「四角」, as in 「丸か四角か」.
• Antonym円形えんけいWrittenWritten, formal word for a circular shape, contrasted with 「四角」; common in describing shapes and architecture.

Use 「四角」 for squares and quadrilaterals and the adjective 「四角い」 for square shapes; 「真四角」 stresses a perfect square. For circles, the everyday opposite is 「丸」, while 「円形」 suits written descriptions of shapes and buildings.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 四よん角形かくけい、特とくに正方形せいほうけいや長方形ちょうほうけい。また □、■などそのような記号きごう。
2. 角かくばっていること。
3. 型かたにはまっていること。