Present participle of forlet; the act of abandoning, neglecting, or allowing something to happen.
Regular English gerund/present participle formation from 'forlet.' The double-t before '-ing' follows the English rule of doubling consonants after short vowels in stressed syllables.
Medieval texts use 'forletting' when describing lords abandoning their castles or knights forsaking their duties—it's a word choice that suggests something is being actively let go rather than passively lost.
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