How do you describe love?

Is it that moment of cuddling with the one you love....wrapping your arms with her/his? ....Is it that surprise of a girls face when she sees her dad in uniform come home from overseas....where she runs up into his arms? .....Is it seeing the tears of a son kneeling at his moms hospital bed as she is dying from cancer? .....Is it the woman bystander who performs CPR on a man who just collapsed at a bus stop?.......How do you describe love? :-)