One of the first high ballistic coefficient bullets made was by one of the majors (don't even remember which) that flooded the magazines with ads about there revolutionary bullet with a nose designed with a "secant ogive" shape of the tip. Ogive has a more specific meaning in statistical analysis, having to do with a cumulative distribution curve. The term ogive came about because it looked like some specific Greek arch style. With bullets it means the curve of the point, Traditional pointed bullets had a tangent ogive. More bearing surface, shorter curved tip and more drag in the bore, along with more air drag. A secant ogive has a longer thinner tip, less bore contact and less air drag. Downside is harder to stabilize.
Fundamentaly, it is a longer for weight bullet. People picked up on the technical, really non-informative name and blabbered for years about it.
In a choke, it would mean a choke with a curved transition. I don't know if it is really a true ogive shape or simply a curve.
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