rectangles Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a foursided polygon that has four right angles and each pair of opposite sides parallel and of the same length Example Sentence Squares and rectangles are examples of polygons. Synonyms box; oblong; four-sided figure Antonyms circle Hear It! Say It! Write It! rectangles Switch to cursive Start Share with your friends: