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PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

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The nine dictionaries of the former PIARC Terminology database have now been merged into a single PIARC Road Dictionary covering all the technical aspects of roads and engineering structures throughout their life cycles (design, construction, operation including traffic and transport, and recycling or disposal) while adding a number of relevant concepts in related fields (environment, mathematics and statistics, physics and chemistry, data processing, finance and procurement, law and regulations, etc.).

Consult this multidisciplinary dictionary and display the results in up to three languages at the same time!

Help for users

At the present time, this web-based dictionary contains approximately 16,300 concepts in English and French (the reference languages), and a variable number of terms in thirty-five other languages.

The PIARC Committee on Terminology (CTERM) regularly updates the terms and definitions in the reference languages, with inputs from the PIARC Technical Committees.

Translations into other languages are complemented and updated in liaison with the member countries of PIARC.

Any suggestions for additions or improvements are welcome, in any language!

  • Download help

    Consultation on-line of the PIARC Road Dictionary (June 2016)

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