A tradition is a ritual, belief or object passed down within a society, still maintained in the present, with origins in the past. Common examples include holidays or impractical but socially meaningful clothes (like lawyer wigs or military officer spurs), but the idea has also been applied to social norms such as greetings. Traditions can persist and evolve for thousands of years—the word "tradition" itself derives from the Latin tradere or traderer literally meaning to transmit, to hand over, to give for safekeeping—and new traditions continue to appear today. While it is commonly assumed that traditions have ancient history, many traditions have been invented on purpose, whether that be political or cultural, over short periods of time. Certain scholarly fields, such as anthropology and biology, have adapted the term "tradition," defining it more carefully than its conventional use in order to facilitate scholarly discourse.