Letter A

Ad lib

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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's wishes.' 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 can have water, the doctor's order might read: 'Water ad lib' (water as desired)

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