0 a period of time that is part of a particular longer period of time:
We divided the study into three periods: the entire 12-year period, the most recent 6-year subperiod and the most recent 3-year subperiod .
Just like the main periods, each sub-period is characterized by the particular qualities and significations of the ruling planets.
The bedrock was formed during the Pennsylvanian geologic subperiod.
A new suffixless intensifier, pretty, surfaced in the last subperiod, 1640-1710.
