Definition: The word "keesler" comes from a Greek word meaning "to go in at." It was used by King James I to refer to someone who had gone into exile or was held captive. In the 16th century, it was common for people to be known as "keeslers," indicating that they had been taken prisoner and were confined to a certain territory. The word has since evolved into a generic term referring to a person who is being held against their will without their consent in an illegal or oppressive situation.