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The abbreviation that is commonly used to indicate 'before a meal' in medical terminology is "ac," which stands for "ante cibum," a Latin phrase that translates directly to "before meals." This terminology is widely utilized in medical settings to provide clear instructions regarding medication timing in relation to food intake.

In clinical practice, medications may be prescribed with the "ac" designation to ensure that they are taken at the appropriate time to maximize their effectiveness and minimize potential interactions with food. This is particularly important for certain medications that require an empty stomach for optimal absorption.

Recognizing these types of abbreviations is essential for healthcare professionals to ensure safe and effective patient care. The other abbreviations listed, such as "pc" (which means 'after meals'), "od" (which stands for 'once daily'), and "oz" (which denotes 'ounce'), do not convey the same meaning and are therefore not relevant to the timing indicated by "ac."