What is "terminological inexactitude"

n. (context euphemistic English) A lie or falsehood.

Terminological inexactitude is a phrase introduced in 1906 by British politician (later Prime Minister) Winston Churchill. Today, it is used as a euphemism or circumlocution meaning a lie or untruth.

Churchill first used the phrase during the 1906 election. Following the election, speaking in the House of Commons on 22 February 1906 as Under-Secretary of the Colonial Office, he repeated what he had said during the campaign:

It seems this first usage was strictly literal, merely a roundabout way of referring to inexact or inaccurate terminology. But it was soon interpreted or taken up as a euphemism for an outright lie. To accuse another member in the House of lying is unparliamentary, so a way of implying that without saying it was very useful.