Frequency: The word is one of the 700 most common words in English.
1.
Itself is used as the object of a verb or preposition when it refers to something that is the same thing as the subject of the verb.
Scientists have discovered remarkable new evidence showing how the body rebuilds ~ while we sleep...
Unemployment does not correct ~.
PRON: v PRON, prep PRON
2.
You use ~ to emphasize the thing you are referring to.
I think life ~ is a learning process...
The involvement of the foreign ministers was ~ a sign of progress...
PRON emphasis
3.
If you say that someone is, for example, politeness ~ or kindness ~, you are emphasizing they are extremely polite or extremely kind.
I was never really happy there, although the people were kindness ~...
PRON: n PRON emphasis
4.
an end in ~: see end