front door

Short definition from Wiktionary

Noun

1. 1
   The door at the main entrance to a building or house, normally fronts onto a street.
2. 2
   The entire main entrance to a building or house.
3. 3
   The habitual or designated main entrance to a room that has more than one door.
4. 4
   The normal portal page to a website.
5. 5
   The path of a pitch which starts inside and then slides over the plate.
6. 6
   vagina or penis, as a means of sexual intercourse, contrasted with the anus or "back door"