redundant (Adjective) — More than is needed, desired, or required. ex. "yet another book on heraldry might be thought redundant" ex. "skills made redundant by technological advance"
redundant (Adjective) — Repetition of same sense in different words. ex. "at the risk of being redundant I return to my original proposition"
redundant (Adjective) — Laid off work because the job position was no longer needed.
redundant (Adjective) — (computing) duplicating the function of another component of a system, providing back-up in case of failure.