greater in size or importance or degree
"for the greater good of the community"
"the greater Antilles"
comparative form of great: more great
"The greater the effort you put into studying, the higher your grades will be."
In plain English: Greater means bigger, stronger, or more important than something else.
"The greater number of students passed the exam this year."
Usage: Use "greater" to describe something that has a higher degree of importance, size, or intensity than another thing. It functions strictly as a comparative adjective and should not be used to mean "larger" when referring to physical dimensions unless comparing magnitude in an abstract sense.
The word greater is simply a comparative form of good that has traveled into English from Old French and Latin. It originally meant "more excellent" or "superior," but its usage expanded over time to describe anything larger in size, amount, or degree.