Here is a list of 100 important SAT vocabulary words and their definitions:

Top 100 SAT Vocabulary Words

1. Enigma - a mystery; hard to understand or explain

2. Apathy - lack of emotion or interest

3. Candor - frankness; honesty

4. Reticent - restrained; uncommunicative

5. Aesthetic - concerning art or beauty

6. Ascetic - without indulgence or luxuries

7. Autonomy - self-rule; independence

8. Disdain - contempt

9. Innocuous - harmless; insignificant

10. Banal - commonplace; dull; ordinary

11. Ambiguous - unclear; undecided

12. Anarchy - lack of government; chaos

13. Ameliorate - to improve

14. Atrophy - to waste away from lack of use

15. Innovate - to make changes; to modernize

16. Servile - overly submissive; cringing

17. Extol - to praise

18. Augment - to add to; increase

19. Benevolent - kindly; to wish well

20. Derision - contempt; ridicule

21. Disparity - inequality

22. Flagrant - glaringly wrong; conspicuously faulty

23. Indolence - laziness

24. Acquiesce - to give in; agree

25. Prodigal - extravagant; wasteful

26. Capricious - whimsical; unpredictable

27. Prosaic - commonplace; uninspired; dull

28. Austere - severe; strict

29. Complacent - smug; self-satisfied

30. Compliance - conforming to a request or demand

31. Dubious - doubtful

32. Ephemeral - short-lived; fleeting

33. Inevitable - unavoidable; bound to happen

34. Insipid - bland; boring

35. Obscure - unclear; clouded; partially hidden

36. Depravity - corruption; wickedness

37. Discern - to distinguish one thing from another

38. Expedite - to quicken

39. Peripheral - on the edge; unimportant

40. Taciturn - quiet; uncommunicative; silent

41. Apprehensive - fearful; worried

42. Fastidious - finicky; overly critical

43. Novel - new; interesting

44. Parsimony - stinginess

45. Provincial - narrow-minded; unsophisticated

46. Respite - a break; a rest

47. Anecdote - a brief, humorous story

48. Pedestrian - commonplace; ordinary

49. Acumen - keen insight; shrewdness

50. Adversity - hardship; misfortune

51. Ambivalent - having mixed feelings about something

52. Camaraderie - trust and friendship among people

53. Censure - to express severe disapproval

54. Coherent - logical and consistent

55. Compassion - sympathetic concern for others

56. Compromise - an agreement reached by mutual concession

57. Condescending - having a superior attitude toward others

58. Convergence - the process of coming together

59. Deleterious - causing harm or damage

60. Digression - a temporary departure from the main subject

61. Diligent - showing care and effort in one's work

62. Divergent - tending to be different or develop in different directions

63. Empathy - the ability to understand and share others' feelings

64. Erudite - having or showing great knowledge or learning

65. Exemplary - serving as a desirable model

66. Frugal - economical with regard to money or food

67. Galvanize - to shock or excite someone into taking action

68. Hypothesis - a proposed explanation made on limited evidence

69. Impetuous - acting quickly without thought or care

70. Integrity - honesty and strong moral principles

71. Intuitive - based on what one feels to be true without reasoning

72. Longevity - long life

73. Mundane - lacking interest or excitement; dull

74. Novice - a person new to or inexperienced in a field

75. Ominous - giving the impression something bad will happen

76. Ostentatious - characterized by vulgar or pretentious display

77. Perfidious - deceitful and untrustworthy

78. Precocious - having developed abilities at an earlier age than usual

79. Prosperity - the state of being prosperous; wealth

80. Provocative - causing annoyance or strong reaction

81. Prudent - acting with care and thought for the future

82. Querulous - complaining in a petulant manner

83. Reclusive - avoiding the company of others; solitary

84. Reconciliation - the restoration of friendly relations

85. Resilient - able to recover quickly from difficulties

86. Spurious - false or fake; not genuine

87. Superfluous - unnecessary, especially through being more than enough

88. Surreptitious - kept secret, especially because it would not be approved of

89. Tactful - having sensitivity in dealing with others or difficult issues

90. Tenacious - persistent; determined

91. Transient - lasting only for a short time

92. Venerable - accorded respect, especially because of age or wisdom

93. Adamant - refusing to change one's mind

94. Adept - very skilled or proficient at something

95. Admonish - to warn or reprimand someone firmly

96. Adroit - clever or skillful

97. Affable - friendly, good-natured, or easy to talk to

98. Alacrity - brisk and cheerful readiness

99. Altruistic - showing a disinterested and selfless concern for others

100. Amalgamate - combine or unite to form one organization or structure