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Tri- or '''tria-''' is a numerial prefix meaning 3 that can be either Greek or Latin ; though occasionally Tre- and Ter- also exist for Latin. Examples are:


"Tri-" is now a productive prefix in English, even for words that are not of immediate Latin or Greek origin:

  • A trimonthly event occurs every three months.

  • A tri-captain ( U.S. only?) is one of three equal captains of a sports team.


Examples of the rare English "ter-" and "tre-" are:

The Sanskrit cognate "tri-" has been used as a Prefix For Unknown Elements indicating that it is three rows below the nearest known element in the Periodic Table .