Definitions
1.AdverbChiefly preceded by he, she, they, etc., lived: often used as a formulaic ending in fairy tales, stories for children, and similar works: in a state of happiness for the rest of his, her, their, etc., lives."And they lived happily ever after."
2.NounA story, or a conclusion to a story, in which all the loose ends of the plot are tied up, and all the main characters are left in a state of contentment or happiness.
3.NounA happy period of time which is imagined never to end; specifically, the state of happiness in which one or more people (typically a loving couple) dwell for the rest of his, her, their, etc., lives.