emerald n./adj.

  1. N-COUNT An emerald is a precious stone which is clear and bright green.
  2. COLOUR Somethig that is emerald is bright green in colour.

palatable adj.

  1. ADJ-Graded If you describe food or drink as palatable, you mean that it tastes pleasant.
  2. ADJ-GRADED If you describe something such as an idea or method as palatable, you mean that people are willing to accept it.

shipment n.

  1. N-COUNT A shipment is an amount of a particular kind of cargo that is sent to another country on a ship, train, aeroplane, or other vehicle.
  2. N-UNCOUNT The shipment of a cargo somewhere is the sending of it there by ship, train, aeroplane, or some other vehicle.

coincide vi.

  1. V-RECIP If one event coincides with another, they happen at the same time.
  2. V-RECIP If the ideas or interests of two or more people coincide, they are the same.

nuclear adj.

  1. ADJ Nuclear means relating to the nuclei of atoms, or to the energy released when these nuclei are split or combined.
  2. ADJ Nuclear means relating to weapons that explode by using the energy released when the nuclei of atoms are solit or combined.

schedule n./vt.

  1. N-COUNT A schedule is a plan that gives a list of events or tasks and the time at which each one should happen or be done.
  2. N-UNCOUNT You can use schedule to refer to the time or way something is planned to be done. For example, if something is completed on schedule, it is completed at the time planned.
  3. VERB If something is scheduled to happen at a particular time, arrangements are made for it to happen at that time.
  4. N-COUNT A schedule is a written list of things, for example a list of prices, details, or conditions.
  5. N-COUNT A schedule is a list of all the times when trains, boats, buses, or airvraft are supposed to arrive at or leave a particular place.
  6. N-COUNT In a school or college, a schedule is a diagram that shows the times in the week at which particular subjects are taught.

luxuriant adj.

  1. ADJ-GRADED Luxuriant plants, trees, and gardens are large, healthy, and growing well.
  2. ADJ-GRADED If you describe someone's hair as luxuriant, you mean that it is very thick and healthy.

quasar n.

  1. N-COUNT A quasar is an object far away in space that produces bright light and radio waves.

commodious adj.

  1. ADJ-GRADED A commodious room or house is large and has a lot of space.

Paleolithic adj.

  1. relating to Stone Age(= the period of time thousands of years ago when people used stone tools and weapons).

simultaneously adv.

simultaneous

  1. ADJ Things which are simultaneous happen or exit at the same time.

comet n.

  1. N-COUNT A comet is a bright object with a long tail that travels around the sun.