in·te·gral 
(ĭntĭ-grəl, ĭn-tĕgrəl)
(ĭntĭ-grəl, ĭn-tĕgrəl)adj.
1. Essential or necessary for completeness; constituent: The kitchen is an integral part of a house.
2. Possessing everything essential; entire.
3. (ĭntĭ-grəl) Mathematics
a. Expressed or expressible as or in terms of integers.
b. Expressed as or involving integrals.
n.
1. A complete unit; a whole.
2. (ĭntĭ-grəl) Mathematics
a. A number computed by a limiting process in which the domain of a function, often an interval or planar region, is divided into arbitrarily small units, the value of the function at a point in each unit is multiplied by the linear or areal measurement of that unit, and all such products are summed.
b. A definite integral.
c. An indefinite integral.
[Middle English, from Old French, from Medieval Latin integrālis, making up a whole, from Latin integer, complete; see INTEGER.]
in′te·grali·ty (-grălĭ-tē) n.
inte·gral·ly adv.