Ply - What does ply mean?

Definition of PLY:

A term used to refer to a single layer in a multi-layered material, structure, or construction.

Here is the Harvard-style citation to use if you would like to reference this definition of the word ply:
Label Planet (2020) What does ply mean? | Ply Definition. Available at: https://www.labelplanet.co.uk/glossary/ply/ (Accessed: January 1, 2023).