Ato – Definition & Meaning

The word ato is a term that is often used in different contexts, but not everyone is familiar with its meaning. In this article, we will explore the definition and meaning of ato, its origin, associations, synonyms, antonyms, and provide examples of how it is used in different sentences.


Ato is a word that has different meanings depending on the context in which it is used. One of the most common definitions of ato is a unit of measurement used to describe the amount of radiation that an object is exposed to. In physics, ato is an abbreviation for “attometer,” which is a unit of length equal to 10^-18 meters.
Another definition of ato is a Japanese honorific title used to address men who are older or higher in rank. In this context, ato is similar to the English titles of “Mr.” or “Sir.”


The origin of the word ato can be traced back to different languages. In physics, ato comes from the Greek word “attos,” which means “small.” In Japanese, ato is derived from the Chinese characters “阿” and “翁,” which mean “elderly man.”

Meaning in different dictionaries

The meaning of ato can vary depending on the dictionary being consulted. In the Oxford English Dictionary, ato is defined as “a unit of measurement for radiation exposure.” In the Merriam-Webster Dictionary, ato is defined as “a Japanese honorific title used to address men who are older or higher in rank.”


In addition to its definitions, ato is also associated with different concepts. In physics, ato is associated with radiation and atomic particles. In Japanese culture, ato is associated with respect and politeness.


Some synonyms of ato include “elderly man” (in Japanese), “Mr.” or “Sir” (in English), and “small” (in physics).


As ato is a unit of measurement and a Japanese honorific title, it does not have any antonyms.

The same root words

The root word of ato is “attos,” which is derived from the Greek language and means “small.” This root word is also used in other scientific terms such as attosecond, attometer, and attomole.

Example Sentences

Here are some examples of how ato is used in different sentences:

  • The workers were exposed to 10 atos of radiation during the accident.
  • Ato Tanaka is the CEO of the company.
  • Please wait for Ato Nakamura, he is the one in charge of the meeting.
  • The scientists used an attosecond laser to study the movement of electrons.
  • The distance between the atoms was measured in attometers.
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