"Eau de toilette" is French for toilet water. The term "eau de toilette" is used in the fragrance industry to define the dilution of a scent.
Eau de toilette is one of the most diluted and cheapest forms of fragrance. The fragrance industry designates terms, such as perfume, eau de perfume, eau de toilette, eau fraiche and eau de cologne, to indicate the concentration of a fragrance. Perfume is the most concentrated and expensive form of fragrance and contains 15 to 30 percent of the essential fragrance, while eau de perfume usually contains 8 to 15 percent, eau de toilette 5 to 8 percent and eau fraiche and eau de cologne contain the least amount of essential fragrance. A small dab of perfume goes a long way, as its high concentration means it lasts longer.