Merriam-Webster Collegiate Dictionary - require

 verb  (~d; requiring)  Etymology: Middle English requeren, from Anglo-French requere, from Vulgar Latin *requaerere to seek for, need, ~, alteration of Latin ~re, from re- + quaerere to seek, ask  Date: 14th century  transitive verb  1.  a. to claim or ask for by right and authority  b. archaic request  2.  a. to call for as suitable or appropriate the occasion ~s formal dress  b. to demand as necessary or essential ; have a compelling need for all living beings ~ food  3. to impose a compulsion or command on ; compel  4. chiefly British to feel or be obliged — used with a following infinitive one does not ~ to be a specialist — Elizabeth Bowen  intransitive verb archaic ask  Synonyms: see demand