# redefinition of SI base units

> revised definitions of the SI base units, adopted at the 26th General Conference on Weights and Measures (CGPM), that came into force on 20 May 2019

**Wikidata**: [Q3076763](https://www.wikidata.org/wiki/Q3076763)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/2019_revision_of_the_SI)  
**Source**: https://4ort.xyz/entity/redefinition-of-si-base-units


## References

1. Freebase Data Dumps. 2013