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Abbreviation for the Latin "ad libitum" Ad lib: Abbreviation for the Latin "ad libitum" meaning "at pleasure" and"at one's pleasure, as much as one desires, to the full extent of one'swishes." Sometimes seen on a prescription or doctor's order. For example,during an overnight fast when the patient is not to eat any food but canhave water, the doctor's order might read: "Water ad lib" (water asdesired).