the science of matter and energy and their interactions
a belief (or system of beliefs) accepted as authoritative by some group or school
the rational investigation of questions about existence and knowledge and ethics
any personal belief about how to live or how to deal with a situation
in accordance with nature; relating to or concerning nature
existing in or produced by nature; not artificial or imitation
existing in or in conformity with nature or the observable world; neither supernatural nor magical
a notation cancelling a previous sharp or flat
