must

I

(New American Roget's College Thesaurus)

v. ought, should, had better, have [got] to, need, needs must, have no choice [but to]; be required, obliged, bound, compelled, doomed, destined, etc. See necessity.

II

(Roget's IV) n.

Syn. requirement, need, obligation; see necessity 2 .

v.

Syn. ought, should, have to, have got to, be compelled, be necessitated, be obliged, be required, be doomed, be destined, be ordered, be directed, be made, be driven, must needs*, have no choice*, be pushed to the wall*, be one's fate*; see also need .

III

(Roget's 3 Superthesaurus)

I

n.

1. requirement imperative, necessity, need, prerequisite, obligation, essential, exigency, fundamental.

2. mustiness mold, mildew, fungus, dry rot.

II

v.

have to, obligated to, required to, should, have no choice, compelled, forced, have no alternative, doomed to, bound. see necessary

IV

(Roget's Thesaurus II) I verb To be required or compelled to do: need. Idioms: have got to, have to, must needs. See NECESSARY. II noun 1. An act or course of action that is demanded of one, as by position, custom, law, or religion: burden1, charge, commitment, duty, imperative, need, obligation, responsibility. See OBLIGATION. 2. Something indispensable: condition, essential, necessity, need, precondition, prerequisite, requirement, requisite, sine qua non. See NECESSARY.