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1. The place where one may purchase tickets to a performance, such as a film, play, concert, etc.; usually located within the venue. You can purchase your tickets online, but if you'd like to pay in cash, you can buy them at our box office.
2. A show's or performance's overall financial success as measured by ticket sales, usually used in the form "at the box office." Though it was critically acclaimed as the summer's best movie, it didn't do very well at the box office.
1. The office where seats for a play, concert, or other form of entertainment may be purchased, as in Tickets are available at the box office. It is so called because originally (17th century) it was the place for hiring a box, a special compartment of theater seats set aside for ladies. [Second half of 1700s]
2. The financial receipts from a performance; also, a show's relative success in attracting a paying audience. For example, You may not consider it great art, but this play is good box office. [c. 1900]