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 search engine‘s point of view. Reference - https://www.searchmetrics.com/glossary/keyword-proximity/
Keyword proximity in SEO refers to how close together keywords are to one another, or to another element on the website. There is a real art to nailing down keyword proximity within a body of text.
It measures the distance between two keywords in the text. Keyword proximity is used by some search engines to measure the relevancy of a given page to the search request. The idea is that the closer two keywords to each other are, the more relevant the page, keyword density measures how many times (not how far) a given keyword appears on a page.
Keyword proximity describes the proximity or the distance between two or more keywords within a text.
Keyword Proximity refers to the distance between two words or phrases, or how close keywords are to each other within a body of text. The closer the two keywords are to each other, the higher the weight for that phrase.