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.
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.