Definitions from Wiktionary ( )

▸ noun:  A wing of a building, notably in a church separated from the nave proper by piers.
▸ noun:  A clear path through rows of seating.
▸ noun:  A clear corridor in a supermarket with shelves on both sides containing goods for sale.
▸ noun:  Any path through an otherwise obstructed space.
▸ noun:  (transport) Seat in public transport, such as a plane, train or bus, that's beside the aisle.
▸ noun:  (US, politics) An idiomatic divide between the Republican Party and the Democratic Party, who are said to be on two sides of the aisle.
▸ noun:  The path of a wedding procession in a church or other venue; (by extension, metonymically) marriage.

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