noun

• (countable) A domesticated subspecies of red junglefowl (Gallus gallus domesticus), especially so-called when young.
  "Some chickens lay eggs almost every day. […] Chickens are kept for their meat, too."
• (uncountable) The meat from this bird eaten as food.
  "Amongst thee more harmless reptiles to be found were several lizards and iguanas. The natives killed these and used them for food. The flesh was not despised by explorers, and I was told it tasted exactly like chicken; but, however good it might have been, my courage was not suffcient to enable me to overcome my prejudice against tasting it."
• (archaic) The young of any bird; a chick.
  "There they are – four ugly little chickens, a bit more than half-feathered, and all gaping mouths and bare bellies."
• (countable, slang, sometimes derogatory) A coward.
  "'Why, what a chicken you are! You are not afraid of being robbed; are you?' said Jonas."

adj

• (informal, sometimes derogatory) Cowardly.
  "Why do you refuse to fight? Huh, I guess you're just too chicken."

verb

• (intransitive) To avoid a situation one is afraid of.
  "For the umpteenth time, I chickened."

noun

• (UK dialectal or obsolete) plural of chick
  "The 21 or 22 day the Chicken are hatch'd; […]"