Where does “ordinary language” come from?

ordinary language (English) comes from English language, from Middle English langage, from Old French language, from Vulgar Latin linguaticum, from Latin lingua, from Latin -ula, from Proto-Indo-European -tlom, from Proto-Indo-European -trom — Derives agent nouns from verbs, denoting someone...

Ancestry of “ordinary language”, step by step

ordinary language traces back through two separate lines of ancestry.

via English language

StepLanguageWordMeaning
1EnglishlanguageA body of words, and set of methods of combining...
2Middle Englishlangagelanguage, tongue, speech; dialect, idiom, local...
3Old Frenchlanguagelanguage (style of communicating)
4Vulgar Latinlinguaticumlanguage
5Latinlinguatongue; a speech; an utterance or expression
6Latin-ularegō + API → rēgula; tegō + API → tēgula;...
7Proto-Indo-European-tlomAlternative form of *-trom
8Proto-Indo-European-tromForms nouns denoting a tool or instrument
9Proto-Indo-European-tḗrDerives agent nouns from verbs, denoting someone...

via English ordinary

StepLanguageWordMeaning
1Englishordinary"A person with authority; authority, ordinance.";...
2Anglo-NormanordenarieAlternative form of ordinaire
Every word from Proto-Indo-European -tḗrEvery word from Latin -ulaEvery word from Latin lingua