Assertion: metric system's unit | /r/HasProperty | defined in terms of metric units
Facets:
value: since the 19th century
type: TEMPORAL
Source sentences:
text: Although U.S. customary units have been defined in terms of metric units since the 19th century, as of 2019 the United States is one of only three countries (the others being Myanmar and Liberia) that have not officially adopted the metric system as the primary means of weights and measures.