noun: a branch of knowledge or study dealing with a body of facts or truths systematically arranged ... systematic knowledge of the physical or material world gained through ...
sci·ence [ s ənss] (plural sci·ences) noun : Definition: 1. study of physical world: the study of the physical and natural world and phenomena, especially by using systematic ...
Science fiction includes such a wide range of themes and subgenres that it is notoriously difficult to define. This is a list of definitions that have been offered by authors ...