What is keyword density 1 point?

According to AdHang.com: Keyword density is the number of times a targeted word/phrase for SEO purposes appears in an article or page in relation to the total word count.

According to HubSpot "Keyword density — also called keyword frequency — is the number of times a specific keyword appears on a webpage compared to the total word count. It's often reported as a percentage or a ratio; the higher the value, the more your selected keyword appears on your page".