: to claim or ask for by right and authority. b. archaic : request. 2. a. : to call for as suitable or appropriate. the occasion requires formal dress. b. : to demand as necessary or essential : have a compelling need for. all living beings require food. 3. : to impose a compulsion or command on : compel. 4. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.