functional requirement

noun 0.794

quality requirement

noun 0.782

requisite

noun 0.756

prerequisite

noun 0.660

prereq

noun 0.642

mandatory

noun 0.634

necessity

noun 0.634

need

noun 0.628

requisition

noun 0.627

specification

noun 0.625

qualification

noun 0.619

obligation

noun 0.611

demand

noun 0.604

needing

noun 0.587

constraint

noun 0.584

precondition

noun 0.580

necessitation

noun 0.576

stipulation

noun 0.575

desideratum

noun 0.572

obligatoriness

noun 0.565

criterion

noun 0.564

mandate

noun 0.559

must-have

noun 0.558

dependency

noun 0.555

expectation

noun 0.552

request

noun 0.547

wajib

noun 0.544

provision

noun 0.543

compulsory

noun 0.542

quire

noun 0.542

perquisite

noun 0.536

recommendation

noun 0.536

must

noun 0.534

parameter

noun 0.531

essential

noun 0.531

want

noun 0.530

imperative

noun 0.529

demander

noun 0.528

compulsion

noun 0.527

conditionality

noun 0.525

legal duty

noun 0.524

sufficient condition

noun 0.522

condition precedent

noun 0.521

behoof

noun 0.520

necessaire

noun 0.520

condition

noun 0.519

preferred

noun 0.518

desire

noun 0.517

definition

noun 0.514

sine qua non

noun 0.514

responsibility

noun 0.514

predicate

noun 0.513

postulate

noun 0.512

demandingness

noun 0.511

exigency

noun 0.507

duty

noun 0.506

ingredient

noun 0.506

restriction

noun 0.505

necessary room

noun 0.504

attribute

noun 0.503

proviso

noun 0.502

rule

noun 0.502

compliance

noun 0.501

reason

noun 0.501

eligibility

noun 0.500

craving

noun 0.500