Definition of "tessellate"

(transitive) To cover with tiles or stones, as a mosaic; to tile.  examples

(intransitive, geometry) Of a two-dimensional shape, such that multiple copies of itself placed edge to edge cover an area leaving no space between the shapes.  examples

(transitive, geometry) To completely fill (an area) when multiple copies of one or more two-dimensional shapes are placed edge to edge.  examples