Repetition of linguistic information inherent in the structure of a language, as singularity in the sentence It works.
Excessive wordiness or repetition in expression.
Chiefly British
The state or fact of being unemployed because work is no longer offered or considered necessary.
A dismissal of an employee from work for being no longer necessary; a layoff.
Electronics Duplication or repetition of elements in electronic equipment to provide alternative functional channels in case of failure.
Repetition of parts or all of a message to circumvent transmission errors.
usage note
Usage Note: The usages that critics have condemned as redundancies fall into several classes. Some expressions, such as old adage, mental telepathy, and VAT tax have become fixed expressions and seem harmless enough. In some cases, such as consensus of opinion, hollow tube, and refer back, the use of what is regarded as an unnecessary modifier or qualifier can sometimes be justified on the grounds that it in fact makes a semantic contribution. Thus a hollow tube can be distinguished from one that has been blocked up with deposits, and a consensus of opinion can be distinguished from a consensus of judgments or practice. Some locutions, such as close proximity, have been so well established that criticizing them may seem petty. See Usage Note at: rarely See Usage Note at: refer
The American Heritage® Dictionary of the English Language, Fourth Edition