A covered structure in front of the entrance to a building. (Cambridge Dictionary)
A covered area adjoining an entrance to a building and usually having a separate roof. (Merriam – Webster)
A porch is a sheltered area at the entrance to a building. It has a roof and sometimes has walls. (Collins Dictionary)
A porch is a raised platform built along the outside wall of a house and often covered with a roof. (Collins Dictionary)
A covered shelter projecting in front of the entrance of a building. (Oxford Dictionaries)
Porch. Your Dictionary.
What’s the Difference Between a Patio and a Porch?