roam

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To move about without purpose or plan; wander. synonym: wander.
• intransitive verb To turn the attention from one subject to another with little clarity or coherence of thought.
• intransitive verb To move or pass over the body.
• intransitive verb To be directed without apparent purpose; look in an idle or casual manner.
• intransitive verb To use a cell phone network outside of a home service area as defined by a service plan.
• intransitive verb To wander over or through.
• intransitive verb To be directed over or around (an area).
• noun The act or an instance of roaming.

from The Century Dictionary.

• noun The act of wandering; a ramble.
• To walk; go; proceed.
• To wander; ramble; rove; walk or move about from place to place without any certain purpose or direction.
• Synonyms Rove, Wander, etc. See ramble.
• To range; wander over: as, to roam the woods.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To range or wander over.
• noun The act of roaming; a wandering; a ramble.
• intransitive verb To go from place to place without any certain purpose or direction; to rove; to wander.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb intransitive To wander or travel freely and with no specific destination.
• verb intransitive, computing, telecommunications To use a network or service from different locations or devices.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb move about aimlessly or without any destination, often in search of food or employment