Licence/ˈlaɪsns/ Definition 1 of 4Pro Tip 1/3Legally Required Licences are often mandatory for specific activities, like driving. You need a driving licence to legally operate a car. Pro Tip 2/3Specific Terms Every licence comes with conditions and rules you must follow. His driving licence has a condition that requires wearing glasses. Pro Tip 3/3Valid Period A licence has a set validity period after which it must be renewed. Her driving licence is valid for ten years.