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Vernacular is the everyday, ordinary language that people in a particular place actually speak - not the formal, official version taught in books, but the real, casual way locals talk, including slang and regional expressions. You could talk about the 'local vernacular' of a city, or how a book is written 'in the vernacular' instead of in a very formal style. It can also describe ordinary, local styles in things other than language, like 'vernacular architecture' - simple, local building styles, as opposed to grand buildings designed by a famous architect.
方言、日常口語；（建築）在地民間風格
組成This word probably comes from an old Latin word meaning something like 'native' or 'belonging to the home' - the language that's 'native' to a place, not brought in from outside.
原始詞典資料11 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
vernacularnoun/vəˈnækjələ/
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The language of a people or a national language.
- The principal vernacular of the United States is English.
- The idea that the Bible should be translated into vernaculars was explosive in medieval society.
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Everyday speech or dialect, including colloquialisms, as opposed to standard, literary, liturgical, or scientific idiom.
- Near-synonyms: basilect, demotic
- Street vernacular can be quite different from what is heard elsewhere.
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Language unique to a particular group of people.
- Near-synonyms: jargon, argot, dialect, slang
- For those of a certain age, hiphop vernacular might just as well be a foreign language.
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A language lacking standardization or a written form.
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Indigenous spoken language, as distinct from a literary or liturgical language such as Ecclesiastical Latin.
- Vatican II, a church council in the 1960s, allowed the celebration of the mass in the vernacular.
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architectureA style of architecture involving local building materials and styles; not imported.
vernacularadj/vəˈnækjələ/
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Of or pertaining to everyday language, as opposed to standard, literary, liturgical, or scientific idiom.
- Near-synonyms: common, everyday, indigenous, ordinary, vulgar, colloquial, basilectal, demotic
- There are blacktips, silvertips, bronze whalers, black whalers, spinner sharks, and bignose sharks. These of course are vernacular names, but this is one case where the scientific nomenclature does not clarify the species, since it is now being revised.
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Belonging to the country of one's birth; one's own by birth or by nature.
- Near-synonyms: native, indigenous; endemic
- a vernacular disease
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architectureOf or related to local building materials and styles; not imported.
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artartsConnected to a collective memory; not imported.
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biologynatural-sciencestaxonomyNot attempting to use the rules of a taxonomic code, especially, not using scientific Latin.
- An English vernacular name for Rosa multiflora is multiflora rose.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。