Tri-

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-" are "ternary", the analogue of "binary, and "tercentenary", a 300th anniversary. The Sanskrit cognate "tri-" has been used a prefix for unknown elements indicating that it is three rows below the nearest known element in the periodic table.

 

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