Where does “Londonism” come from?

Londonism (English) comes from English ism, from English -ism, from Latin -ismus, from Ancient Greek -ισμός, from Ancient Greek -μός, from Proto-Indo-European -mós — Creates action/result nouns from verb stems.

Londonism (English): A characteristic of Londoners; A mode of speaking...

Definitions

  1. A characteristic of Londoners; A mode of speaking...

Ancestry of “Londonism”, step by step

Londonism traces back through two separate lines of ancestry.

via English ism

StepLanguageWordMeaning
1EnglishismAn ideology, system of thought, or practice that...
2English-ismUsed to form nouns of action or process or result...
3Latin-ismus-ism
4Ancient Greek-ισμόςForms abstract nouns
5Ancient Greek-μόςForms abstract nouns
6Proto-Indo-European-mósCreates action/result nouns from verb stems

via English London

StepLanguageWordMeaning
1EnglishLondonSituated on the tidal River Thames in southeast England, with a metropolitan population of more than 13,000,000
2Middle EnglishLondon
3Old EnglishLundenLondon
4LatinLondiniumLondon
5Proto-Celtic*Londinyom
6Proto-Indo-Europeanlendʰ-land, heath; loins
Every word from Proto-Indo-European -mós