Both Uses

loophole
in
The Stranger, by Albert Camus
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The only thing that interests me now is the problem of circumventing the machine, learning if the inevitable admits a loophole.†
Chpt 2.5 *

loophole = a gap in a rule, allowing avoidance of the rule's core intent
This problem of a loophole obsesses me; I am always wondering if there have been cases of condemned prisoners' escaping from the implacable machinery of justice at the last moment, breaking through the police cordon, vanishing in the nick of time before the guillotine falls.†
Chpt 2.5

Definitions:

(1) (loophole)
a gap in a rule, allowing avoidance of the rule's core intent -- especially in the text of a law or contract
(2) (meaning too rare to warrant focus)
Less commonly, loophole can refer to a small opening in a castle that provides light and air, and allows an arrow to be fired from within. The opening is narrow enough that it is largely protects from incoming arrows.