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A unit of weight measurement in the avoirdupois system, commonly abbreviated as "oz." One ounce equals 1/16 of a pound or approximately 28.35 grams. In culinary contexts, ounces are standard for measuring ingredients in English-speaking countries, particularly in the United States. The term originates from the Latin word "uncia," meaning one-twelfth, though the modern ounce differs from historical definitions. Ounces are used for both solid ingredients (flour, sugar, spices) and liquid volumes when measured by weight rather than volume.

Ounces are fundamental to recipe development, food labeling, and professional kitchen standardization. They provide precise measurements for scaling recipes, calculating nutritional information, and ensuring consistency in batch production. Professional chefs and bakers rely on ounce measurements for accuracy, particularly in baking where precise ratios are critical. Converting between ounces and metric units (grams) is essential for international recipe adaptation and professional food science applications.