noctem de firma (nok-t<<schwa>>m dee f<<schwa>>r-m<<schwa>>), n.[Law Latin “night of duty (payable)”] Hist. The duty or custom of providing entertainment or provisions for a night. • At the time of the Norman Conquest, this was the duty or custom of entertaining the king for one
night. — Also termed noctes; firma noctis.
[Blacks Law 8th]