Concept set CENTER OR MIDDLE

What's in the mid of a plane or sphere or equally far away from two ends.

Related concept sets

CENTER OR MIDDLEinstanceofCENTER
CENTER OR MIDDLEinstanceofMIDDLE
CENTER OR MIDDLEnarrowerCENTER
CENTER OR MIDDLEnarrowerMIDDLE
Id Concept in source Conceptlist