A search term can be made up of a combination of keywords. The keyword proximity refers to the distance between the search term’s individual keywords.
For example: a website contains the keywords that make up the search term “dentist Boston implant” in the heading “Your professional dentist in Boston; dental practice for minimally invasive implants”. The search term proximity between “dentist” and “Boston” is one word, between “Boston” and “implant” it is five words. The smaller the distance between a search term’s individual keywords, the more relevant it will be from a ‘s point of view.