An arrangement of points or particles or objects in a regular periodic pattern in 2 or 3 dimensions WordNet 3.0 & Open English WordNet

In geometry and group theory, a lattice in the real coordinate space R n {\displaystyle \mathbb {R} ^{n}} is an infinite set of points in this space with the properties that coordinate-wise addition or subtraction of two points in the lattice produces another lattice point, that the lattice points are all separated by some minimum distance, and that every point in the space is within some maximum distance of a lattice point. Wikipedia

A repeating arrangement of points Wikipedia Disambiguation

A discrete subgroup of Rn and its generalizations Wikipedia Disambiguation

Subgroup of a real vector space Wikidata

A regular spacing or arrangement of geometric points, often decorated with a motif. OmegaWiki

A discrete subgroup of Rn which is isomorphic to Zn (considered as an additive group) and spans the real vector space Rn. Wiktionary