- (now historical) A men's hairstyle whose primary attribute is a braid or ponytail at the back of the head, such as that worn by men in Imperial China. [from 18th c.]
- (computing) A data structure in which objects are added to one end, called the tail, and removed from the other, called the head (- a FIFO queue). The term can also refer to a LIFO queue or stack where these ends coincide. [from 20th c.]
- (heraldry) An animal's tail. [from 16th c.]
- A waiting list or other means of organizing people or objects into a first-come-first-served order.
- A line of people, vehicles or other objects, in which one at the front end is dealt with first, the one behind is dealt with next, and so on, and which newcomers join at the opposite end (the back). [from 19th c.]
- (computing) To add to a queue data structure.
- To arrange themselves into a physical waiting queue.
- To put oneself or itself at the end of a waiting line.
- To fasten the hair into a queue.