Definitions of Day:

• noun:   United States writer best known for his autobiographical works (1874-1935)
• noun:   a period of opportunity

  Example: "He deserves his day in court"

• noun:   some point or period in time

  Example: "It should arrive any day now"

• noun:   the recurring hours when you are not sleeping (especially those when you are working)

  Example: "My day began early this morning"

• noun:   time for Earth to make a complete rotation on its axis

  Example: "Two days later they left"

• noun:   a day assigned to a particular purpose or observance

  Example: "Mother's Day"

• noun:   the time after sunrise and before sunset while it is light outside

  Example: "The dawn turned night into day"

• noun:   the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis

  Example: "How long is a day on Jupiter?"

• noun:   an era of existence or influence

  Example: "In the day of the dinosaurs"

• noun:   the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
• name:  A surname (common: 1 in 2325 families; popularity rank in the U.S.: #245)