Any path through an otherwise obstructed space.
Seat in public transport, such as a plane, train or bus, that's beside the aisle.
A clear corridor in a supermarket with shelves on both sides containing goods for sale.
A wing of a building, notably in a church separated from the nave proper by piers.
The path of a wedding procession in a church or other venue; (by extension, metonymically) marriage.
An idiomatic divide between the Republican Party and the Democratic Party, who are said to be on two sides of the aisle.
A clear path through rows of seating.
A door or other means of entering.
Permission to enter.
The entrance of the Moon into the shadow of the Earth in eclipses, or the Sun's entrance into a sign, etc.
The act of entering.
To manifest or cause to be manifested in the temporal world; to effect ingression
To enter (a specified location or area)
To intrude or insert oneself
To enter into a zodiacal sign