What does obsolete mean?

The term "obsolete" refers to something that is no longer in use, outdated, or has been replaced by newer alternatives. It conveys the idea that whatever is being described is no longer relevant or effective in the current context. This could apply to technology, ideas, practices, or products that have been superseded by more modern or efficient options.

In contrast, the other choices present concepts that are directly opposed to the meaning of "obsolete." "Current" suggests something that is up-to-date, while "novel" implies something new or innovative. "Modern" also carries the connotation of being contemporary or relating to the present time. Hence, "outdated" is the most fitting definition because it captures the essence of what it means for something to be considered obsolete.