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power set (set of all subsets of a set)
A power set is a set consisting of all subsets of a set.
(set theory) intersection
In math class, we learned about the intersection.
(set theory) union
In math class, we learned about the concept of union sets.
communal letterbox
There is a communal letterbox in our apartment.
pressure points; vital points
He used his knowledge of pressure points to alleviate my headache.
pressure points
He accurately understood the location of the pressure points.
Giant's kettle, pothole, the formation in a river
This giant's kettle was formed during the Ice Age.
buttonhole (hole for a button)
The buttonhole of my shirt has torn.
burrow (A tunnel or hole)
He found a small animal's burrow in the forest.
Alternative spelling of 枘穴
It seems that the mortise of this old furniture is loose.
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