Merriam-Webster's Collegiate® Dictionary, 11th Edition
ALLEY
I. noun (plural alleys)
Etymology: Middle English, from Anglo-French alee, from aler to go
Date: 14th century
a garden or park walk bordered by trees or bushes,
2. a. a grassed enclosure for bowling or skittles, a hardwood lane for bowling, the space on each side of a tennis doubles court between the sideline and the service sideline, an area in a baseball outfield between two outfielders when they are in normal positions, a narrow street,
II. noun (plural alleys)
Etymology: by shortening and alteration from alabaster
Date: 1720
a playing marble