My working definition for Love is from science fiction author, Robert A. Heinlein. He wrote that love is the state of being where another persons happiness is necessary for your own happiness. Interestingly, he was polyamourous back in the 1940's and wrote books that discussed this such as "The Moon is a Harsh Mistress" and "Friday".
I myself like words that have different meaning and then I can use them correctly for precision in communication. (Altho research has suggested that humans think using fuzzy sets, which likely means trying to precisely define 'big concepts' with humans almost impossible.) But for myself, I will use the definitions in the sticky post at the top of the site.
Warm regards, Rick.