DE RIGUEUR
Source: 567
‖De ri′gueur″ (?). [[F. See 2d Rigor.]] According to strictness (of etiquette, rule, or the like); obligatory; strictly required.
Source: 567
‖De ri′gueur″ (?). [[F. See 2d Rigor.]] According to strictness (of etiquette, rule, or the like); obligatory; strictly required.