An area outside a house with a solid floor but no roof, used in good weather for relaxing, eating, etc: (Cambridge Dictionary)
A patio is an area of flat blocks or concrete next to a house, where people can sit and relax or eat. (Collins Dictionary)
An inner court open to the sky. (Merriam – Webster)
A paved outdoor area adjoining a house. (Oxford Dictionaries)
What’s the Difference Between a Patio and a Deck?