Answer: integral

AnswerCrossword Clue
INTEGRALBasic
integralIncluded as part of the whole rather than supplied separately
integrala total unit
integralOf or denoted by an integer
integralHaving or containing all parts that are necessary to be complete
integralInvolving only integers, esp. as coefficients of a function
integralNecessary to make a whole complete; essential or fundamental
INTEGRALCrucial
INTEGRALNecessary, as a part
INTEGRALAbsolutely necessary
INTEGRALUnlike 1-2
INTEGRALMandatory
INTEGRALComplete
INTEGRALBranch of calculus
INTEGRALEssential.
INTEGRALEssential to completeness.
INTEGRALComplete.
INTEGRALVital
INTEGRALIndispensible
INTEGRALCalculus computation
INTEGRALNecessary