Every word he uses has a well defined, concrete purpose.

In short: the two words define each other.

The words of themselves do not define me.

So I used that word to define what I wanted to do.

If I could only find the words to define it with!

If any word defines this collection it is substance.

That changing word or phrase defines the theme for that season.

The word can define an action in the past, present or future:

How can words define such a wonderful, kind, loving, irreplaceable man.