"It's" is an abbreviation of "it is" and should never be confused with "its", which is a possessive pronoun. [EXAMPLE: It's well known that a cat licks its paws.]
The point at which a language no longer has competent users is referred to as language death.
America
A point. (Also time, language, concepts, etc.)
A language point refers to a specific aspect or feature of a language that is being taught or studied. It could include grammar rules, vocabulary usage, pronunciation patterns, or any other linguistic element that is the focus of instruction.
Culture
Depends on your point of view
A floating point constant value.
A : voice is the language an author uses to tell a story, while point of view is the perspective from which a narrator tells a story.
In simple language, a vertex is a point. Vertices are the plural
Wikipedia can be a starting point.
English
No, a dialect is a specific form of a language spoken in a particular region or by a particular group of people. It is a variation of the standard language, characterized by unique vocabulary, grammar, and pronunciation.