Yes, Friday is considered a proper noun. In English grammar, a proper noun refers to the name of a specific person, place, or thing. Days of the week, such as Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday, are all proper nouns. This is because they refer to specific days that are universally recognized and defined.
Proper nouns are capitalized to distinguish them from common nouns. For instance, when you say, ‘I have a meeting on Friday,’ ‘Friday’ is capitalized because it denotes a specific day, as opposed to just any day of the week. In contrast, if you simply say ‘a day,’ ‘day’ here would be a common noun.
In summary, since Friday identifies a specific day of the week and follows the rules of capitalization, it is classified as a proper noun.