afterglow
Synonym discussion
Sense: noun/1
Afterglow, glow, thrill, satisfaction, and aftereffect can all describe what remains after an experience, but they point to different kinds of results. Afterglow is a warm, pleasant feeling that continues after a concert, holiday, success, or loving moment. Glow can also describe happiness, but it often focuses on a person's visible look or proud mood. Thrill is sharper and more excited, while satisfaction is calmer and more matter-of-fact. Aftereffect is the broadest and most neutral word; it can be good, bad, or merely noticeable, so it lacks the warmth built into afterglow. You can talk about the afterglow of a wedding or a win, but the aftereffect of medicine or stress may have no positive feeling at all.
Etymology
Afterglow was formed in English from after and glow. It first named the light that remains after the sun or another bright light is no longer visible. Later, speakers extended the image to describe the warm good feeling that continues after a happy experience has ended.