What is the meaning of required?

verb

• Require as useful, just, or proper.
  • usage: "It takes nerve to do what she did"; "success usually requires hard work"; "This job asks a lot of patience and skill"; "This position demands a lot of personal sacrifice"; "This dinner calls for a spectacular dessert"; "This intervention does not postulate a patient's consent"
  • synonyms: necessitate, ask, postulate, need, require, take, involve, call for, demand
• Consider obligatory; request and expect.
  • usage: "We require our secretary to be on time"; "Aren't we asking too much of these children"; "I expect my students to arrive in time for their lessons"
  • synonyms: ask, require, expect
• Make someone do something.
  • synonyms: command, require
• Have need of.
  • usage: "This piano wants the attention of a competent tuner"
  • synonyms: want, need, require

adjective

• Necessary for relief or supply.
  • usage: "provided them with all things needful"
  • synonyms: needed, needful, requisite
• Required by rule.
  • usage: "in most schools physical education is compulsory"; "attendance is mandatory"; "required reading"
  • synonyms: compulsory, mandatory