acquiescence—Some act of concurrence by the adjoining owners bearing on the practical location of their common boundary, where the definite, or more accurate position of the line, or lines has not, or cannot be defined by survey, or with the tacit consent of one by not interposing a formal objection to what might be an encroachment by the other, all subject to judicial review as to the legal effect.

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Source: NSPS “Definitions of Surveying and Associated Terms“, used with permission.

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