Blue Sort 26 extra words

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Across
  1. 4. Of or relating to or shaped like an octagon.
  2. 5. Each of four parts of a plane, sphere, space, or body divided by two lines or planes at right angles.
  3. 7. A group of four people playing music or singing together.
  4. 8. Relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.
  5. 12. Last month of the year.
  6. 13. A person who is between 80 and 89 years old.
  7. 15. A group of eight musicians.
  8. 16. A unit used to measure the intensity of a sound.
  9. 18. A metric unit of length, equal to one tenth of a metre.
  10. 19. Consisting of five parts or things.
  11. 21. A colourless flammable hydrocarbon of the alkane series, present in petroleum spirit.
Down
  1. 1. Each of four equal groups into which a population can be divided according to the distribution of values of a particular variable.
  2. 2. A unit of liquid capacity equal to a quarter of a gallon.
  3. 3. An athletic event comprising five different events for each competitor.
  4. 5. Recurring every four years.
  5. 6. A group of five people playing music or singing together.
  6. 9. A line of verse consisting of five metrical feet.
  7. 10. A thousand raised to the power of six.
  8. 11. A predatory myriapod invertebrate with a flattened elongated body composed of many segments. Most segments bear a single pair of legs, the front pair being modified as poison fangs.
  9. 14. aAmetric unit of length, equal to one hundredth of a metre.
  10. 17. A ten sided shape.
  11. 20. By a specified amount in or for every hundred.