IPA: /ˈɡreɪtə/
KK: /ˈɡreɪtər/
Larger in size, amount, or degree than something else; often used to compare two things.
The greater the effort you put in, the better the results will be.
Comparative: greater
Superlative: greatest
Greater → It is formed from "great" (from Old English *grēat*, meaning large or big) and "-er" (meaning more). The word "greater" means more large or of larger size compared to something else.
Think of something that is 'more large' — 'great' means big, and '-er' indicates a comparison, so greater refers to something that is larger than another.