Ad hoc

From Styleguide

ad hoc

A wireless network involving a direct connection between two or more systems or computers with no router or central base station involved.

This is different from infrastructure mode, in which wireless devices connect via a formal networking structure such the Internet.

Example: We ran a series of Twisted Metal: Head-Onmultiplayer matches in the office to test out the PlayStation Portable’s ad hoc capabilities.

Wrong: adhoc, ad-hoc.