: a passage between sections of seats in a church, theater, airplane, etc.
: a passage where people walk through a store, market, etc.
Full Definition of AISLE
: the side of a church nave separated by piers from the nave proper
a (1): a passage (as in a theater or railroad passenger car) separating sections of seats (2): such a passage regarded as separating opposing parties in a legislature <supported by members on both sides of the aisle>
b: a passage (as in a store or warehouse) for inside traffic