Other forms: teaspoons
In cooking, a teaspoon is a small unit of measurement, as well as the name of the utensil you use to measure it. If you like your tea slightly sweet, you might add just a teaspoon of sugar to it.
You can also call a small spoon used for stirring coffee or tea a teaspoon. When you're making a recipe, it's good to know that a teaspoon is equal to one-third of a tablespoon, or five milliliters. The word teaspoon dates from the 1680s.