Companionate love refers to the feelings of intimacy and affection we feel for another person when we care deeply for the person but do not necessarily experience passion or arousal in his or her presence.
Companionate love, as in the love between two best friends, grows out of a mutual enjoyment in companionship and the intimacy of a close friendship. This love develops slowly and a significant amount of comfort develops between the partners This love, however, need not be between two people, as it is often felt for animals by their caretakers. Many single adults live with a dog or cat that provides friendship and camaraderie for the owner
Other /More definition: