Is it possible to include contents of a wiki page in another wiki page?

Question

Is it possible with the Github wiki to include the contents of another wiki page in a wiki page?

Answer 1

Not directly.

Yo would need to use a preprocessor in order to include or embed one document in another.
See for instance gajus/gitdown:

Gitdown adds additional functionality (generating table of contents, including documents, using variables, etc.) to GitHub Flavored Markdown.

In your case: Include file.