noun

• (UK, Ireland, Commonwealth, less common in North America) A line of people, vehicles or other objects, usually one to be dealt with in sequence (i.e., the 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).
  "I was absent-minded at the moment and was last in the queue."
• (computing) A data structure in which objects are added to one end, called the tail, and removed from the other, called the head (in the case of a FIFO queue). The term can also refer to a LIFO queue or stack where these ends coincide.
  "2005, David Flanagan, Java in a Nutshell, p. 234, Queue implementations are commonly based on insertion order as in first-in, first-out (FIFO) queues or last-in, first-out queues (LIFO queues are also known as stacks)."
• (heraldry) An animal's tail.
  "HESSE: Az., a lion, queue fourchée, rampt., barry of ten, arg. and gu., crowned, or, and holding in his dexter paw a sword, ppr., hilt and pommel, gold."
• (now historical) A men's hairstyle with a braid or ponytail at the back of the head, such as that worn by men in Imperial China.
  "[…], there were seated astraddle the whole hundred of the baronet's musqueteers, each engaged in plaiting into a queue the hair of the man who sat in front of him."

verb

• (intransitive) To put oneself or itself at the end of a waiting line.
  "Although there is a spacious circulating area beyond the platforms at Clacton, there is severe overcrowding on peak Saturdays; at times of pressure passengers have to queue out into the street [...]"
• (intransitive) To arrange themselves into a physical waiting queue.
• (computing, transitive) To add to a queue data structure.