Learn how to say Tessellations correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word tessellate:
1 (often as adjective tessellated) decorate (a floor or pavement) with mosaics.
2cover (a plane surface) by repeated use of a single shape, without gaps or overlapping.
late 17th century (as tessellated): from late Latin tessellat-, from the verb tessellare, from tessella, diminutive of tessera (see tessera)