Britishism

[ brit-i-shiz-uh m ]
/ ˈbrɪt ɪˌʃɪz əm /

noun

Briticism.
any custom, manner, characteristic, or quality peculiar to or associated with the British people.
the aggregate of such qualities regarded as characteristic of a British person: His cool reserve is just part of his Britishism.

Origin of Britishism

First recorded in 1880–85; British + -ism

British Dictionary definitions for britishism

Britishism
/ (ˈbrɪtɪˌʃɪzəm) /

noun

a variant of Briticism