Operational Inadmissibility of Macroscopic Wavefunctions Author: Radu Necsanu ORCID: https://orcid.org/0009-0009-1281-9180 DOI: https://doi.org/10.5281/zenodo.18408307 Abstract This paper establishes an operational criterion for when it is admissible to ascribe a single pure quantum state to a macroscopic collective degree of freedom. Working strictly within standard quantum mechanics, it delineates the conditions under which environmental interactions suppress the reduced coherence required for such an attribution at any finite experimental resolution. The result is intended to clarify the operational limits of macroscopic superposition claims without invoking modified dynamics or interpretive assumptions.