All 4 Uses

coherent
in
The Gunslinger
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They came on, screaming with frantic incoherency.†
Chpt 1

incoherency = inability to think clearly; or an instance of not thinking clearly; or describing parts as not fitting together in a consistent or pleasing manner

standard prefix: The prefix "in-" in incoherency means not and reverses the meaning of coherency. This is the same pattern you see in words like invisible, incomplete, and insecure.
He went to the altar, stood beside it for a moment coherent thought was now almost impossible.†
Chpt 3

coherent = sensible and clear; or describing parts as fitting together in a consistent or pleasing manner
The gunslinger felt no urge to think coherently, or to plan.†
Chpt 4 *

coherently = in a sensible and clear manner; or in a manner where parts fit together consistently or pleasingly
The boy still did not speak (and would have been incapable of any coherent explanation, had it been required), but for the first time the awful smile softened a little.†
Chpt 4

coherent = sensible and clear; or describing parts as fitting together in a consistent or pleasing manner

Definitions:

(1) (coherent)
sensible and clear; or describing parts as fitting together in a consistent or pleasing manner
(2) (meaning too rare to warrant focus)
A comprehensive dictionary will have more specialized definitions of coherent such as one used in physics.