空间格子（lattice）是：表达晶体结构周期重复规律的几何图形。即空间格子就是描述晶体结构格子构造的简单几何图形。
The crystal lattice is the symmetrical three-dimensional structural arrangements of atoms, ions or molecules (constituent particle) inside a crystalline solid as points. It can be defined as the geometrical arrangement of the atoms, ions or molecules of the crystalline solid as points in space.