Definition of "rectangle" in English

noun

1. (geometry) Any quadrilateral having opposing sides parallel and four right angles.

2. (nontechnical) Such a quadrilateral that is oblong (longer than it is wide): one that is not regular (equilateral), that is, any except a square.

3. (archaic) A right angle.

4. (archaic) The product of two quantities.

adjective

1. (archaic) Right-angled.

   • a rectangle triangle