| No. | Item | Definition |
|---|---|---|
| 1. | acceleration | rate of speed change |
| 2. | alliance | union for mutual support |
| 3. | alloy | mixture of metals |
| 4. | ambassador | official diplomatic representative |
| 5. | amphibian | animal living on land and water |
| 6. | anthem | official national song |
| 7. | antibody | protein fighting specific invaders |
| 8. | archipelago | chain or group of islands |
| 9. | asteroid | small rocky body in space |
| 10. | atom | smallest unit of an element |
| 11. | biography | written life story of someone |
| 12. | capital | city serving as government center |
| 13. | century | period of one hundred years |
| 14. | chronology | arrangement by time order |
| 15. | circuit | complete path for electricity |
| 16. | comet | icy body with a tail |
| 17. | constitution | fundamental law of a state |
| 18. | currency | money used in a country |
| 19. | decimal | number based on tenths |
| 20. | delta | river mouth deposit landform |
| 21. | democracy | government by the people |
| 22. | dialect | regional form of a language |
| 23. | dynasty | line of hereditary rulers |
| 24. | earthquake | sudden shaking of the ground |
| 25. | eclipse | blocking of one celestial body |
| 26. | ecosystem | community and its environment |
| 27. | element | pure substance of one atom type |
| 28. | empire | group of territories under one rule |
| 29. | energy | capacity to do work |
| 30. | enzyme | protein speeding chemical reactions |
| 31. | equator | line around Earth’s middle |
| 32. | equinox | day and night nearly equal |
| 33. | estuary | tidal mouth of a river |
| 34. | fjord | long narrow sea inlet |
| 35. | folklore | traditional beliefs and stories |
| 36. | fossil | preserved remains of ancient life |
| 37. | fraction | number expressing part of whole |
| 38. | friction | force resisting motion |
| 39. | galaxy | vast system of stars |
| 40. | glacier | slow-moving mass of ice |
| 41. | gravity | force pulling masses together |
| 42. | habitat | natural home of an organism |
| 43. | hemisphere | half of the Earth |
| 44. | herbivore | plant-eating animal |
| 45. | hieroglyph | picture-based ancient symbol |
| 46. | homophone | word sounding like another |
| 47. | integer | whole number positive or negative |
| 48. | irony | contrast between expectation and reality |
| 49. | isotope | atom form with neutrons differing |
| 50. | isthmus | narrow land joining larger lands |
| 51. | jurisdiction | legal authority over an area |
| 52. | latitude | distance north or south |
| 53. | legend | traditional story of fame |
| 54. | longitude | distance east or west |
| 55. | magnet | object producing magnetic field |
| 56. | mammal | warm-blooded animal with hair |
| 57. | median | middle value in data |
| 58. | meridian | imaginary north-south line |
| 59. | metaphor | direct comparison without like |
| 60. | millennium | period of one thousand years |
| 61. | molecule | group of bonded atoms |
| 62. | monarch | king or queen ruler |
| 63. | monsoon | seasonal wind with heavy rain |
| 64. | mythology | collection of traditional myths |
| 65. | nebula | cloud of gas in space |
| 66. | novel | long fictional prose work |
| 67. | omnivore | animal eating plants and animals |
| 68. | oracle | person or source of prophecy |
| 69. | pandemic | disease outbreak across countries |
| 70. | parliament | national lawmaking body |
| 71. | peninsula | land almost surrounded by water |
| 72. | philosophy | study of fundamental ideas |
| 73. | plague | deadly epidemic disease |
| 74. | planet | large body orbiting a star |
| 75. | plateau | high flat land area |
| 76. | predator | animal that hunts others |
| 77. | president | elected national leader |
| 78. | protagonist | main character in a story |
| 79. | quarantine | isolation to prevent disease spread |
| 80. | renaissance | period of cultural rebirth |
| 81. | reptile | cold-blooded scaly vertebrate |
| 82. | republic | state without a monarch |
| 83. | revolution | overthrow of a government |
| 84. | satire | humor exposing human faults |
| 85. | savanna | tropical grassland with trees |
| 86. | senate | upper legislative chamber |
| 87. | simile | comparison using like or as |
| 88. | solstice | year’s longest or shortest day |
| 89. | species | basic biological classification group |
| 90. | strait | narrow water passage |
| 91. | synonym | word with similar meaning |
| 92. | theorem | statement proved by reasoning |
| 93. | treaty | formal agreement between states |
| 94. | tsunami | huge sea wave from disturbance |
| 95. | tundra | treeless cold plain |
| 96. | vaccine | substance giving disease protection |
| 97. | velocity | speed in a direction |
| 98. | verdict | formal decision by a jury |
| 99. | volcano | mountain that erupts lava |
| 100. | voltage | electrical potential difference |