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redundant (adj.)

"superfluous, exceeding what is natural or necessary," c. 1600, from Latin redundantem (nominative redundans), present participle of redundare, literally "overflow, pour over; be over-full;" figuratively "be in excess," from re- "again" (see re-) + undare "rise in waves," from unda "a wave" (from PIE *unda-, nasalized form of root *wed- (1) "water; wet").

Also sometimes in 17c. in a more positive sense, "abounding to excess or fullness, exuberant, plentiful," e.g. in "Paradise Lost," though what he meant by it here is anyone's guess:

With burnished neck of verdant gold, erect
Amidst his circling spires that on the grass
Floated redundant.

 Of persons, in employment situations by 1928, chiefly British. Related: Redundantly. As a verb, redund has been tried at least once (1904); the etymological corresponding verb is the Frenchified redound.

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Definitions of redundant from WordNet

redundant (adj.)
more than is needed, desired, or required;
skills made redundant by technological advance
yet another book on heraldry might be thought redundant
redundant (adj.)
repetition of same sense in different words; "at the risk of being redundant I return to my original proposition"- J.B.Conant;
Synonyms: pleonastic / tautologic / tautological
From wordnet.princeton.edu