‘That’s not how you spell “system”,’ said my husband triumphantly, pointing with his whisky glass at a placard inveighing against the ‘Cistem’, held up by a transgender protester on television. ‘No, darling,’ I said, not even assuming a patient tone. ‘It’s a play on words.’

Among people who like using the word gender outside its grammatical homeland, cis- as a prefix is tacked on, to make cisgender: ‘someone whose sense of personal identity corresponds to the sex and gender assigned to him or her at birth’, as the Oxford English Dictionary puts it carefully.