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A teaspoon is an item of cutlery, a measuring instrument, of approximately 5ml, or a unit of measurement of volume (usually abbreviated tsp.).
The fluid scruple is 1⁄24 fluid ounce, 1⁄3 fluid dram, 20 minims, or 1⁄4 teaspoon, or 1 saltspoon. It is therefore equal to 1.23 milliliters.