Synonym: command, demand, lack, necessitate, need, oblige, order, want. Antonym: refuse. Similar words: required, requirement, inquire about, inquiry, request, frequent, frequency, frequently. Meaning: [rɪ'kwaɪə(r)] 
v. 1. require as useful, just, or proper 2. consider obligatory; request and expect 3. make someone do something 4. have need of.
v. 1. require as useful, just, or proper 2. consider obligatory; request and expect 3. make someone do something 4. have need of. 
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151. They may require titration of nitroglycerin, beta blockers, and morphine.
152. Some patients often require treatment with laser or freezing sweep over.
More similar words: required, requirement, inquire about, inquiry, request, frequent, frequency, frequently, equip, equity, equipment, equivalent, quite, liquid, hire, wire, tire, quietly, sequence, quite a few, subsequent, equation, adequate, on fire, fire up, direct, empire, admire, retire, retired.