Teaspoonful

noun

1. The amount that a teaspoon can hold.
2. As much as a teaspoon holds; as a definite quantity, a fluidrachm. When solids are measured by the teaspoonful, the spoon is generally heaped.
3. As much as teaspoon will hold; enough to fill a teaspoon. In cooking, it is usually estimated as 4.9 milliliters, which is 1/6 of a fluid ounce, or 1/3 of a tablespoonful. In cooking recipes it may be abbreviated as t.
4. A unit of capacity equal to the amount a teaspoon can hold which is taken approximately as 5ml.
5. as much as a teaspoon will hold