What is "applicate number"

Applicate \Ap"pli*cate\, a. [L. applicatus, p. p. of applicare. See Apply.] Applied or put to some use.

Those applicate sciences which extend the power of man over the elements.
--I. Taylor.

Applicate number (Math.), one which applied to some concrete case.

Applicate ordinate, right line applied at right angles to the axis of any conic section, and bounded by the curve.