GNU Collaborative International Dictionary of English

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Found one definition

1.       
   metrication (mĕtˌrĭ‑kāˈshŭn), n. The act or process of converting the standard system of units of a country to those of the metric system; metrification; as, “Great Britain has completed its metrification, but the United States still resists complete change”.
   
   [PJC]