Webster 1913 Edition
aile, wing, wing of a building, L.
ala, contr. fr.
A lateral division of a building, separated from the middle part, called the nave, by a row of columns or piers, which support the roof or an upper wall containing windows, called the clearstory wall.
Improperly used also for the have; – as in the phrases, a church with three aisles, the middle aisle.
Also (perhaps from confusion with alley), a passage into which the pews of a church open.
Webster 1828 Edition
AISLE, or AILE,
The wing of a quire; a walk in a church.