Thank you for your inquiry.  Most sources agree on the following definitions:

• Full sun is six or more hours of direct sunlight per day. This doesn't need to be continuous, for example there could be four hours in the morning, shade midday, and three or four hours of sun in the afternoon. It must be direct, full sun.
• Partial sun is between four and six hours of sun a day.
• Partial shade is two to four hours of sun per day.
• Shade, in gardening terms, means less than two hours of sunlight a day.

Please reach out if you have any further questions.