Green’s Dictionary of Slang

temporal adj.

[one would only go to prison (rather than be hanged) for such coining]

(UK Und.) pertaining to the counterfeiting of copper money.

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[UK]Morn. Chron. (London) 10 Feb. 6/2: If anybody was detected in imitating the gold or silver coinage, it was called a ‘spiritual’ business, because it touched his life; hut if it were for copper money only, it was called ‘temporal,’ because he was in no danger of the gallows for that.