To stick together as a unified whole or to be logically connected and make sense.
From Latin cohaerere, from co- (together) + haerere (to stick). The word entered English in the 1600s describing both physical sticking and the abstract idea of ideas fitting together logically.
The word 'cohere' literally means to stick, but physicists discovered that atoms cohere because of electromagnetic forces—invisible glue that holds everything together, which is mind-bending when you think about it.
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