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atto
This term functions exclusively as a combining form or a metric prefix rather than a standalone adjective in general conversation. It is used strictly within scientific, mathematical, and technical registers to describe scales of time or distance that are unimaginably small, such as the duration of an electron's movement.
Because it is a prefix, it does not undergo inflection or change based on the number or gender of the noun it modifies. It is always attached to a base unit, such as "attosecond" or "attogram," to create a specific measurement.