vista

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

• noun A distant view or prospect, especially one seen through an opening, as between rows of buildings or trees.
• noun An avenue or other passage affording such a view.
• noun An awareness of a range of time, events, or subjects; a broad mental view.

from The Century Dictionary.

• noun A view or prospect, especially through an avenue, as between rows of trees; hence, the trees or other things that form the avenue.
• noun Hence Figuratively, a vision; a view presented to the mind in prospect or in retrospect by the imagination: as, a vista of pleasure to come; dim vistas of the past.

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

• noun A view; especially, a view through or between intervening objects, as trees; a view or prospect through an avenue, or the like; hence, the trees or other objects that form the avenue.

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

• noun A distant view or prospect, especially one seen through some opening, avenue or a passage
• noun A site offering such a view.
• noun figuratively A vision, a view presented to the mind in prospect or in retrospect by the imagination.

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

• noun the visual percept of a region