Conforming to a local and mutable standard of right. Having the quality of general expediency.
It is sayd there be a raunge of mountaynes in the Easte, on one syde of the which certayn conducts are immorall, yet on the other syde they are holden in good esteeme; wherebye the mountayneer is much conveenyenced, for it is given to him to goe downe eyther way and act as it shall suite his moode, withouten offence.
'Gooke's Meditations'
—Ambrose Bierce, The Devil's Dictionary