Plural of halfness; multiple instances or types of incompleteness, partiality, or bisected states.
From 'halfness' + '-es' (plural). This plural form allows discussion of multiple instances of partial or incomplete conditions, though it's rarely used in practice.
Halfnesses is so abstract and philosophical that it barely exists in actual English usage, yet it's perfectly grammatical. It represents the 'logical extreme' of English word formation—creating plurals of abstract qualities that few people ever actually discuss.
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