Extra person on a double date ... who's depicted by the last O in 17-, 24-, 39- and 52-Across?

ExtraExtraordinaryBeyond the extraordinary, the extraordinary thing about this word is its Latin origin. Derived from the Latin word "extra," meaning "beyond," it literally means something that is beyond the ordinary.Extraordinary is a word that has been used to describe exceptional individuals since the 15th century. Its etymology is closely tied to the Latin word "extra," which was used to describe something that is beyond or outside the ordinary.Extraordinary has been used in various contexts, including literature and poetry, to describe remarkable people or events. Its meaning has expanded over time, encompassing a range of meanings.PersonPersonThe Latin word "persona" is derived from the word "personare," meaning "to dress up or put on a persona." It originally referred to a character or role played in a play.Person refers to a human being, often used to describe someone's identity or character. Its Latin origin emphasizes the idea of a mask or disguise worn to portray a persona.Person is a word that has been used in various contexts, including literature, philosophy, and psychology. Its meaning encompasses a range of meanings, including the idea of a person's identity or character.DoubleDoubleThe Latin word "duplus" is derived from the word "duplicare," meaning "to double." It originally referred to the act of duplicating or repeating something.Double refers to something that is repeated or duplicated, often with a sense of duplication or duality. Its meaning encompasses a range of meanings, including the idea of something being repeated or mirrored.Double is a word that has been used in various contexts, including literature, art, and architecture. Its meaning is closely tied to the idea of repetition and duplication.DateDateThe Latin word "dies" is derived from the word "day," but the Latin word "dies" is also related to the word "day" through the verb "dies," meaning "to die." It originally referred to a day or period of time.Date refers to a specific time or period, often used to describe a particular moment or event. Its meaning encompasses a range of meanings, including the idea of a specific time or period.Date is a word that has been used in various contexts, including literature, history, and science. Its meaning is closely tied to the idea of a specific time or period.WhosWhosThe Latin word "qui" is derived from the word "quis," meaning "who." It is the masculine form of the Latin word "quis," which was used to describe a person or thing.Whos refers to the person or thing that is being referred to, often used in a more informal or colloquial sense.Whos is a word that has been used in various contexts, including literature, poetry, and everyday language. Its meaning encompasses a range of meanings, including the idea of mystery or enigma.DepictedDepictedThe Latin word "diaphanous" is derived from the word "dipsa," meaning "ray" or "shadow." It is also related to the word "dipsa," which means "ray" or "shadow."Depicted refers to something that is represented or shown, often used to describe art or images. Its meaning encompasses a range of meanings, including the idea of representation or depiction.Depicted is a word that has been used in various contexts, including literature, art, and design. Its meaning is closely tied to the idea of representation or depiction.52Across52AcrossThe Latin word "octavus" is derived from the word "octo," meaning "eight," and the Latin word "avis," meaning "bird." It is a word that refers to a month of the year, the eighth month.