We encounter language as we continuously externalize our biological and cultural identities in the act of living as human beings.
Ideas express the implicit will of the human being to externalize them (what Marcuse called "the imperative quality" of thought).
They externalize a limited awareness, and make possible a very restricted development of both the experience and the language associated with it.
You express yourself in your ideas and thoughts, which you try to externalize materially.
When once we fully grasp these considerations we shall see that it is just as easy to externalize healthy conditions of body as the contrary.
The vital force of the medium might externalize itself and produce in a point of space a vibratory system which should be the counterpart of itself, in a more or less advanced degree of visibility and solidity.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "externalize" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: embody; envisage; incarnate; manifest; materialize; objectify; personify; project; substantiate