ad lib

As desired, freely. Without restriction.

“Ad lib”, short for the Latin phrase “ad libitum”, meaning “at one’s pleasure” or “as desired,” has made its way into various aspects of modern life. In medicine, “ad lib” is commonly used to describe situations where a patient can do something freely—like eat or move about—as they feel able, such as “ambulate ad lib” after surgery.

In the world of performance and speech, “ad lib” refers to impromptu, off-the-cuff remarks or improvisation, whether in acting, music, or even public speaking.