To go from place to place without any certain purpose or direction; to rove; to wander.

To range or wander over.

The act of roaming; a wandering; a ramble; as, he began his roam o'er hill and dale.

ROAM, or Real Time Optimally Adapting Mesh, is a continuous level of detail algorithm that optimizes terrain meshes. On modern computers, sometimes it is more effective to send a small amount of unneeded polygons to the GPU, rather than burden the CPU with LOD calculations -- making algorithms like geomipmapping more effective than ROAM.

Traveling outside of a local cellular coverage area.

to move about or travel, esp. without any real purpose.

Using your cellular phone in a city besides the one in which you live.

a self-serving zealot

The ability for a user to move between different computers and have the same user experience on both computers.

Mobs or NPCs that move around from once place or zone to the next.

the process of moving across a display so that different areas of the image appear on the display screen.

The ability to use networks overseas and cross geographical boundaries whilst using a single number and a single phone.