Strong's 3195 (μέλλω)

about, after that, be (almost), (that which is, things, + which was for) to come, intend, was to (be), mean, mind, be at the point, (be) ready, + return, shall (begin), (which, that) should (after, afterwards, hereafter) tarry, which was for, will, would, be yet

to intend, i.e. be about to be, do, or suffer something (of persons or things, especially events; in the sense of purpose, duty, necessity, probability, possibility, or hesitation)

a strengthened form of G3199 (μέλω) (through the idea of expectation);