the meaning of a word is its use in the language. - Ludwig Wittgenstein

"If Ave say " Plato loves Socrates," the word " loves" which occurs between the word " Plato " and the word "Socrates" establishes a certain relation between these two words, and it is owing to this fact that our sentence is able to assert a relation between the person's name by the words " Plato " and " Socrates." " We must not say, the complex sign ' a R b' says 'a stands in a certain relation R to b' ; but we must say, that ' a' stands in a certain relation to 'b' says that a R b" (3.1432)•
Mr"

"303. "I can only believe that someone else is in pain, but I know it if I am." — Yes: one can make the decision to say "I believe he is in pain" instead of "He is in pain". But that is all. — — What looks like an explanation here, or like a statement about a mental process, is in truth an exchange of one expression for another which, while we are doing philosophy, seems the more appropriate one.
Just try — in a real case — to doubt someone else's fear or pain."

A new word is like a fresh seed sown on the ground of the discussion