What is another word for one-trillionth?
Pronunciation: [wˈɒntɹˈɪli͡ənθ] (IPA) 
One-trillionth is an extremely small quantity and there are a few alternatives to express such a minuscule amount. One of the synonyms for one-trillionth is "picometer," which is a unit of length used in physics and chemistry that is equivalent to one trillionth of a meter. Another term for one-trillionth is "femtosecond," a unit of time used in physics to describe an incredibly brief moment that is equal to one quadrillionth of a second. "Attogram" is another synonym for one-trillionth, which refers to a unit of mass that is one trillionth of a gram. Lastly, "zeptosecond" is a term that represents one trillionth of a trillionth of a second.
