What is entropy mean in this context? "The Bitcoin nonce forms part of the block header, which is used by miners to provide entropy as part of the Proof of Work process, to try and find a hash meeting the difficulty requirement."

Quote taken from the following article.

https://blog.bitmex.com/the-mystery-of-the-bitcoin-nonce-pattern/
It means randomness. In computing, if something a source of entropy means that means it is a source of randomness.