A facsimile is an exact copy of something, made to look precisely like the original. When a museum displays a facsimile of an ancient manuscript, they've created a reproduction so accurate that visitors can see what the original looked like without risking damage to the real thing.

You might encounter facsimiles of famous documents like the Declaration of Independence, where every detail, including the paper texture, ink color, and even age spots, gets carefully reproduced. A facsimile differs from just any copy: a photocopy of your homework is a copy, but a facsimile of a medieval illuminated manuscript would recreate the gold leaf, the hand-lettering style, and the feel of parchment.

The word facsimile is also the formal name for a fax, which makes sense once you understand what fax machines do: they send exact copies of documents through phone lines. When someone says “send me a facsimile,” they usually mean “fax it to me.”

People sometimes shorten the word to fax in everyday conversation, but facsimile carries more weight when you're talking about careful reproductions of important historical objects or documents.