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palindromic twinNoun phrase. A pair of words used as a phrase in a reversible expression such as on page in the palindromic expression ?on page seo does seo ?on page.
link spamLink spam is also known as comment spam, and these comments are the ones you see where the poster includes unwanted links or unrelated text.
spamversibotNoun. Software (aka robot) that is designed to drop benign, relevant comments on blogs in anticipation of revisiting for the purpose of dropping links in later comments. See also: Spam bot
authority siteAn authority site is a particularly high quality website. An authority site could technically be a commercial website that is the authority on a topic, though for many SEOs in certain contexts (ie for the purposes of writing an article) an authority site is generally considered to be either governmental, an association, or otherwise neutral from a commercial perspective.
alt attributeHTML code that provides information used by search engines and screen readers (for blind and visually-impaired people) to understand the contents of an image.