The quality or state of being coherent; logical consistency and clarity.
From cohere + -ency suffix (forming nouns of state or quality). This noun form developed in the 1700s as the adjective 'coherent' became more common in scientific and philosophical writing.
In quantum mechanics, 'coherency' describes when particles march in lockstep like an army regiment—lose that synchronization and you lose the quantum computer's power, which is why quantum machines have to be kept at temperatures colder than outer space.
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