The symmetry that a figure has if it can be made to fit exactly onto the original when it is translated a given distance at a given direction and then reflected over a line. As in translational symmetry, glide-reflectional symmetry exists only for infinite patterns.
literature noun [U] (WRITING). B1 written âartistic âworks, âespecially those with a high and âlasting âartistic âvalue: âclassical/âmodern literature Wuthering Heights is a âclassic of âEnglish literature. More examples. 1  He's very â knowledgeable about â German literature.
Classic is a subjective term in regards to literature. It can mean something that is just old. Sometimes it has to do with the popularity of the book/series. For instance, as the generation that popularized Harry Potter ages it will become a YA classic. A literary classic is another thing all together.