| No. | Item | Definition |
|---|---|---|
| 1. | accountable | required to explain actions |
| 2. | amenable | liable to authority |
| 3. | answerable | responsible or accountable |
| 4. | appointed | officially assigned or fixed |
| 5. | asked for | requested or sought |
| 6. | assigned | given as a task |
| 7. | baseline | minimum necessary standard |
| 8. | basic | forming a necessary base |
| 9. | behooveful | proper or necessary |
| 10. | binding | imposing an obligation |
| 11. | bound | obliged by duty or rule |
| 12. | called for | needed by the situation |
| 13. | cardinal | chief or fundamental |
| 14. | central | main and necessary |
| 15. | component | forming a necessary part |
| 16. | compulsory | required by rule or law |
| 17. | constitutive | forming a necessary part |
| 18. | contractual | required by a contract |
| 19. | critical | extremely important or necessary |
| 20. | crucial | decisive and necessary |
| 21. | de rigueur | required by fashion or etiquette |
| 22. | decreed | ordered officially |
| 23. | demanded | insisted on as necessary |
| 24. | designated | officially chosen or specified |
| 25. | dictated | laid down as necessary |
| 26. | directed | ordered or instructed |
| 27. | due | owed or expected |
| 28. | duty-bound | required by duty |
| 29. | elemental | basic and essential |
| 30. | elementary | basic or fundamental |
| 31. | enforced | made compulsory by authority |
| 32. | entailed | involved as necessary |
| 33. | essential | absolutely needed |
| 34. | exacted | demanded and obtained |
| 35. | expected | considered necessary or usual |
| 36. | explicit | clearly and directly stated |
| 37. | fixed | set and not changeable |
| 38. | forced | made necessary or unavoidable |
| 39. | foundational | serving as a necessary base |
| 40. | fundamental | basic and necessary |
| 41. | hired | employed for pay |
| 42. | honor-bound | required by honor |
| 43. | imperative | vitally necessary |
| 44. | implied | understood as necessary |
| 45. | incumbent | necessary as a duty |
| 46. | indispensable | impossible to do without |
| 47. | inescapable | impossible to avoid |
| 48. | inevitable | certain and unavoidable |
| 49. | inherent | existing as a natural part |
| 50. | integral | necessary to completeness |
| 51. | intrinsic | belonging naturally and necessarily |
| 52. | involved | included as a necessary part |
| 53. | irreducible | not reducible further |
| 54. | key | very important or necessary |
| 55. | levied | imposed as a charge |
| 56. | liable | legally responsible or obligated |
| 57. | mandated | officially required |
| 58. | mandatory | ordered or officially needed |
| 59. | minimal | least necessary |
| 60. | minimum | least amount needed |
| 61. | must-have | something that is necessary |
| 62. | necessary | needed or essential |
| 63. | necessitated | made necessary |
| 64. | needed | wanted or necessary |
| 65. | needful | necessary or useful |
| 66. | nonoptional | not left to choice |
| 67. | obligated | bound to do something |
| 68. | obligatory | required as a duty |
| 69. | obliged | morally or legally bound |
| 70. | ordained | ordered by authority |
| 71. | ordered | commanded or directed |
| 72. | outstanding | still due or unpaid |
| 73. | owed | due as an obligation |
| 74. | owing | due or unpaid |
| 75. | payable | due to be paid |
| 76. | prerequisite | needed before something else |
| 77. | prescribed | officially set as needed |
| 78. | primary | first in importance |
| 79. | principal | main or most important |
| 80. | receivable | due to be received |
| 81. | recruited | enlisted for service |
| 82. | requested | asked for |
| 83. | requisite | needed for a purpose |
| 84. | responsible | having an obligation |
| 85. | retained | kept or engaged for use |
| 86. | set | fixed or established |
| 87. | settled | decided or fixed |
| 88. | sought | looked for or requested |
| 89. | specified | stated as necessary |
| 90. | stated | said or specified |
| 91. | statutory | required by statute |
| 92. | stipulated | set as a condition |
| 93. | subject | liable or exposed to |
| 94. | unavoidable | not able to be avoided |
| 95. | underlying | forming a basic support |
| 96. | unescapable | not possible to escape |
| 97. | used | employed for a purpose |
| 98. | utilized | used for a purpose |
| 99. | vital | necessary for success or life |
| 100. | wanted | desired or needed |