verb:to need something for a particular purpose
The recipe requires two cups of flour to achieve the proper texture.
verb:to demand or insist upon something as an obligation or right
The contract requires the supplier to deliver all goods by the end of June.
verb:to cause something to become necessary or obligatory
His broken wrist required him to wear a brace for six weeks.
verb:to impose a duty or expectation on someone
The teacher requires students to complete their homework before class begins.
