What does "dematerialize" mean?

To disappear by becoming immaterial.

What is a synonym for "dematerialize"?

Common synonyms include: attenuate, be consumed, be gone, cease, cease to be, cease to exist.

Pronounced //ˌdi.məˈtɪɹ.i.ə.laɪz//.

/ˌdi.məˈtɪɹ.i.ə.laɪz/ verb

verb ·Uncommon ·Advanced level

Verb

1
To disappear by becoming immaterial. British, English, Oxford, US, intransitive
"Nightmares were, after all, a type of demon; they could dematerialize in much the way Fiant did."
2
become immaterial; disappear wordnet
3
To cause something to disappear by making it immaterial. British, English, Oxford, US, transitive
"Some magicians claim they can dematerialize their bodies and re-materialize them in a different location."
4
To remove the physical materials from (a process, etc.). British, English, Oxford, US, transitive
"Even though the book is still a difficult object to dematerialize and the paper books are not replaceable, the trend seems to be to prefer an e-book rather than a physical book […]"

"Nightmares were, after all, a type of demon; they could dematerialize in much the way Fiant did."

From de- + materialize.