avenue

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

• noun A wide street or thoroughfare.
• noun A broad roadway lined with trees.
• noun Chiefly British The drive leading from the main road up to a country house.
• noun A means of access or approach.

from The Century Dictionary.

• noun In archaeology, a series of megalithic stones arranged in a row.
• noun A passage; a way or an opening for entrance into a place; any opening or passage by which a thing is or may be introduced or approached.
• noun A roadway of approach to a country-house, particularly when straight, of considerable length, and shaded by a row of trees on each side; a drive in a private country-place; a walk in a garden or demain of some pretensions as to style or size.
• noun A street; properly, a wide street planted with trees and often with turfed spaces on either side, or a garden or shaded promenade in the middle: used in New York, Washington, etc., in the names of the longest and generally the widest streets, as Fifth or Pennsylvania Avenue, but in some American cities without special reference to the character of the street.
• noun Figuratively, means of access or attainment.

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

• noun A way or opening for entrance into a place; a passage by which a place may by reached; a way of approach or of exit.
• noun The principal walk or approach to a house which is withdrawn from the road, especially, such approach bordered on each side by trees; any broad passageway thus bordered.
• noun A broad street.

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

• noun A broad street, especially one bordered by trees (Wikipedia).
• noun A way or opening for entrance into a place; a passage by which a place may be reached; a way of approach or of exit.
• noun The principal walk or approach to a house which is withdrawn from the road, especially, such approach bordered on each side by trees; any broad passageway thus bordered.
• noun A method or means by which something may be accomplished.

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

• noun a line of approach
• noun a wide street or thoroughfare