Search engine results page - definition
The term search engine results page and its abbreviation (SERP) refer to the page(s) of search results that surface for a particular search term.
The term is often used to refer to a web page’s position in the search results based on a particular keyword or keyword phrase.
SERP measurement tools typically measure ‘Top 3’ or ‘Top 5’, and most certainly ‘Page 1’, as this is what SEO practioners aspire to.
Page 1 is most relevant given that 75% of internet users will redefine their search terms before they move to page 2 or beyond.