Antonym: elective. Similar words: require, requirement, inquire about, inquiry, request, frequent, frequency, frequently. Meaning: [rɪ'kwaɪə(r)d] 
adj. 1. necessary for relief or supply 2. required by rule.
adj. 1. necessary for relief or supply 2. required by rule. 
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61. What is required is immediate action, not rhetoric.
62. All students are required to have a medical examination.
63. I am required to act before noon tomorrow.
64. All passengers are required to show their tickets.
65. What's required is a complete reorganization of the system.
66. It was exacting work and required all his patience.
67. These books are compulsory/required reading for students of architecture.
68. He only did what was required .
69. I brought her proficiency up to the required level.
70. All companies are required to conform to these rules.
71. Add more curry powder depending on the strength required.
72. The money collected fell short of the amount required.
73. It required a supreme effort to stay awake.
74. The court required that he should pay the fine.
75. A permit is required for fishing in the canal.
76. The information required can then be retrieved from disk.
77. Every ship is required to radio its position.
78. They required that I go there tonight.
79. The injury required urgent medical attention.
80. Donor organs are constantly required for transplant operations.
81. Witnesses are required to take the oath .
82. An explanation must be required from Mr. Black.
83. A decoder is required for certain television programmes.
84. The headmaster required her to keep silent.
85. Witnesses were required to swear on the Bible.
86. I have done all that is required by law.
87. Students are required to write their exercises in pen.
88. The required technology is probably still two years off.
89. Then he'll know exactly what's required of him.
90. Cooking time required: 30-35 mins.