1. order of magnitude a number assigned to the ratio of two quantities
  2. order Phalangida harvestmen
  3. order Phasmatodea in some classifications considered a suborder of Orthoptera: stick insects; leaf insects
  4. order of payment a document ordering the payment of money
  5. order of the day the order of business for an assembly on a given day
  6. order Chelonethida false scorpions
  7. order Ephemerida mayflies
  8. order Edentata order of mammals having few or no teeth including: New World anteaters; sloths; armadillos
  9. order Foraminifera foraminifers
  10. change of magnitude the act of changing the amount or size of something
  11. order Ganoidei a group of mostly extinct primitive bony fishes characterized by armor-like bony scales
  12. order Pholidota pangolins
  13. absolute magnitude (astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth
  14. order Anacanthini at least partially equivalent to the order Gadiformes in some classifications
  15. order Amphipoda small flat-bodied semiterrestrial crustaceans: whale lice
  16. order Pulmonata large order of gastropods usually breathing by means of a lung-like sac comprising most land snails and slugs and many freshwater snails
  17. order Amoebida the animal order including amoebas
  18. order Araneida spiders
  19. order Batoidei fish with dorsoventrally flattened bodies
  20. order Embiodea web spinners