An old term used to describe a device-to-device network in which devices communicate between one another without going through a router or access point (also known as a peer-to-peer network).
A group of wireless devices communicating directly with each other (peer-to-peer) without the use of an access point.
makeshift, non-general, good for one thing only. Comes from the Latin phrase meaning 'to the thing'. Each time there was a problem they figured out some ad-hoc arrangement that fixed the problem, but it clearly was not going to be a general solution.
A wireless networking not utilising any central point (an access point). The computers on an ad-hoc wireless network will communicate with each other either directly from wireless card to wireless card or through the other wireless computers on the network.
An Ad-Hoc wireless LAN is a group of computers each with wireless adapters, connected as an independent wireless LAN.