Millietuus

Millietuus is a neologism used in speculative and fictional contexts to denote a very small unit of time within a proposed metrology framework. It has no official status in established measurement systems, and its exact meaning varies by author.

The term appears to mirror established prefixes such as milli-, micro-, and nano-, and is intended to evoke a subdivision finer than a millisecond. As a result, millietuus is typically discussed as a conceptual unit rather than a defined standard.

Definitions differ among proponents. In some discussions, one millietuus is defined as 10^-3 of the base time unit of a system; if the base is the second, this would align with a millisecond, while other proposals treat millietuus as a distinct subdivision with its own scale.

Because it lacks formal adoption, millietuus is not used by national or international metrology institutes. It is mainly encountered in thought experiments, speculative fiction, or discussions about ultra-fast timing in theoretical physics and computing.

Related concepts include the millisecond, microsecond, and nanosecond, as well as conjectural notions such as the chronon or Planck time, which are sometimes invoked in debates about fundamental limits of measurement.