Meaning at work can come from contributing to a process, from being challenged, and from engaging in purposeful activity. Understanding your relationship with your job will help you deal with its absence.
There’s a work ethic: the idea that it’s morally good for us to work. But there’s also a work instinct: the use of work to satisfy various psychological needs, quite apart from the practical needs of an income to support ourselves and our family. These needs vary from person to person, and the quality of our retirement, at least initially, will depend to some extent on the particular combination and strength of those needs.