The phrase "main entrance" refers to the primary way to enter a building or location. It is typically the most common and commonly used entrance point. Full definition
To greet as many people as possible, I made a habit of hanging around near the outside main entrance to the church. (redeeminggod.com)
She would also like her dream school to have a single main entrance with security cameras in place. (educationworld.com)
This approach also creates an architectural language for a distinctive main entrance which, while welcoming the visitor, establishes clear separation between public and private areas. (mosart.ie)