What is a subdivision of a cemetery consisting of several burial spaces called?

A subdivision of a cemetery consisting of several burial spaces is referred to as a "lot." In a cemetery context, a lot typically encompasses multiple grave sites and is the standardized term used in various cultures and regions for delineating sections within a burial area.

The other terms listed do not specifically relate to this concept in the same way. "Kever," for example, is a term often used in Jewish tradition to denote a grave or tomb rather than a subdivision. "Kriah" refers to the act of tearing one's clothing as a sign of mourning in Jewish culture, and "Kvurah" relates to burial or interment generally, but not specifically to the subdivision of burial spaces like a lot does. Thus, "lot" is the most accurate choice when discussing the subdivided areas within a cemetery used for burials.