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. 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.