Truncation is a way to search for a root word and its varying endings.
Truncate a search term by placing an a * or ? at the end or root of the word. Which symbol you should use depends on the search tool you are using--most databases and search tools will have a HELP area where you can learn tips on searching that particular database.
Ex. writ* will return results featuring : write, writing, writer, writers, written ...
Ex. compos* will return results featuring : compose, compose, composing, composition ...