The quality or state of sticking to something physically or of remaining loyal to a belief, person, or course of action.
From Middle English and Old French, based on Latin 'adhaerentia.' The '-ency' suffix (from Latin '-entia') creates an abstract noun describing the quality or condition of adherence.
Adherency is one of those old-fashioned words that historians prefer—you're more likely to read about someone's 'adherency to classical principles' in a 19th-century text than in modern writing.
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