compulsory

noun 0.760

obligatoriness

noun 0.687

wajib

noun 0.672

must

noun 0.671

mandate

noun 0.639

requirement

noun 0.634

essential

noun 0.624

requisite

noun 0.619

optional

noun 0.616

must-have

noun 0.608

obligation

noun 0.607

obbligato

noun 0.588

imperative

noun 0.586

mandatory sentence

noun 0.582

nullable

noun 0.570

legal duty

noun 0.560

parameter

noun 0.557

unavoidable

noun 0.550

forcing

noun 0.549

prerequisite

noun 0.546

necessitation

noun 0.544

preferred

noun 0.544

default

noun 0.541

conditional

noun 0.536

typedef

noun 0.534

nonelective

noun 0.532

constraint

noun 0.532

indispensable

noun 0.531

nonessential

noun 0.530

automatic

noun 0.530

mand

noun 0.529

option

noun 0.529

nonnegotiable

noun 0.528

must-see

noun 0.527

functional requirement

noun 0.524

manual

noun 0.524

compulsion

noun 0.524

necessity

noun 0.521

peremptory

noun 0.521

minimum

noun 0.518

standard

noun 0.517

mandamus

noun 0.515

attribute

noun 0.514

bare minimum

noun 0.512

muss

noun 0.512

mando

noun 0.508

sine qua non

noun 0.508

directive

noun 0.507

void

noun 0.506

prereq

noun 0.505

voluntary

noun 0.504

need

noun 0.504

additional

noun 0.504

commandment

noun 0.503

override

noun 0.503

official

noun 0.502

dependency

noun 0.502

instruction

noun 0.501