We don't have synonyms for alnage yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ulnage and aulnage.
(n) :
(historical) Measurement (of cloth) by the ell, specifically, official inspection and measurement of woollen cloth, and attestation of its value by the affixing of a lead seal, as was once required by British law.
(n) :
(historical) A duty paid for such measurement.
(n) :
(historical) Measurement (of cloth) by the ell, specifically, official inspection and measurement of woollen cloth, and attestation of its value by the affixing of a lead seal, as was once required by British law.
(n) :
(historical) A duty paid for such measurement.