The word "extension" is a noun that means The act of extending something; making it longer or wider.. In Bengali, it is expressed as "প্রসারণ, বৃদ্ধি, বিস্তার, দীর্ঘকরণ", which carries the same essential meaning. For example: "The extension of the road will connect two major cities.". Understanding "extension" enhances vocabulary and improves language comprehension for both English and Bengali speakers.