1. “unconditional love”; divine love; love that is spiritual in its nature; love without limitation.

2. New Testament: charitable, selfless, altruistic, and unconditional love; the covenant love of God for humans, as well as the human reciprocal love for God; love for humanity.

Etymology: from Classical Greek: ἀγάπη, agápē; Modern Greek: αγάπη.  Not to be confused with agape [1].

[Alex Grey - Cuddle]

The promise, made when I am in love and because I am in love, to be true to the beloved as long as I live, commits me to being true even if I cease to be in love. A promise must be about things that I can do, about actions: no one can promise to go on feeling in a certain way. He might as well promise never to have a headache or always to feel hungry.
—  C.S. Lewis