Assertion: metric system's prefix | /r/ObjectUse | used within metric system
Facets:
value: formerly
type: TEMPORAL
Source sentences:
text: The prefixes used within the metric system serve to designate a multiple or subdivision of a unit.
text: Some of the prefixes formerly used in the metric system have fallen into disuse and were not adopted into the SI.
text: The prefixes are used within the metric system.