Synonyms of required

Verb

1. necessitate, ask, postulate, need, require, take, involve, call for, demand

usage: require as useful, just, or proper; "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"

2. ask, require, expect, demand

usage: consider obligatory; request and expect; "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"

3. command, require, order, tell, enjoin, say

usage: make someone do something

4. want, need, require, be

usage: have need of; "This piano wants the attention of a competent tuner"

Adjective

1. needed, needful, required, requisite, necessary (vs. unnecessary)

usage: necessary for relief or supply; "provided them with all things needful"

2. compulsory, mandatory, required, obligatory (vs. optional)

usage: required by rule; "in most schools physical education is compulsory"; "attendance is mandatory"; "required reading"