Here's how it's used:
* In performance: An ad lib is an unscripted or improvised line, action, or bit of dialogue added by a performer during a performance.
* In music: Ad lib can refer to a section of music where a performer is free to improvise or add their own embellishments.
* In general: It can mean something is done freely and without strict rules or guidelines.
Examples:
* "The comedian ad-libbed a joke about the audience's reaction."
* "The guitarist took a long ad-lib solo during the bridge of the song."
* "She was given ad-lib time to discuss her favorite topics."