According to Mrs. Granger, how do words get their meanings and when do new words enter the language in Frindle?

Mrs. Granger says that words enter our
language when people begin using them, and their meaning comes from the
people.

When Nick gives his report on the
dictionary, he tries to distract Mrs. Granger by asking her where words come from.  He
does not get the answer he expects.

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We all agree … But of course, the dictionary was
worked on by hundreds of very smart people for many years, so as far as we are
concerned, that dictionary is the law. (ch 5, p.
31)

In an interview, Nick
tells Alice Lunderson that his teacher told him words get their meanings from
people.

“Well,
my teacher Mrs. Granger said that all the words in the dictionary were made up by
people, and they mean what they mean because we say they do.” (ch 12, p.
75)

Mrs. Granger’s lesson was
not lost on Nick.  He realizes that he can create his own word, and he does.  As a
result of his experiment, the whole school and then the whole town begins using the word
frindle, and soon it makes the national media and even enters the
dictionary.