The Collaborative International Dictionary of English v.0.48:
Culminate \Cul"mi*nate\ (k[u^]l"m[i^]*n[=a]t), v. i. [imp. & p.
p. Culminated (-n[=a]`t[e^]d); p. pr. & vb. n.
Culminating (-n[=a]`t[i^]ng.] [L. cuimen top or ridge. See
1. To reach its highest point of altitude; to come to the
meridian; to be vertical or directly overhead.
As when his beams at noon
Culminate from the equator. --Milton.
2. To reach the highest point, as of rank, size, power,
The reptile race culminated in the secondary era.
The house of Burgundy was rapidly culminating.
Moby Thesaurus II by Grady Ward, 1.0:
28 Moby Thesaurus words for "culminating":
capping, closing, completing, completive, completory, concluding,
conclusive, consummating, consummative, consummatory, crowning,
culminative, ending, final, finalizing, finishing, fulfilling,
heading, last, outtopping, overtopping, perfecting, perfective,
terminal, terminating, terminative, topping, ultimate