Obsolete and redundant both mean no-longer-wanted, by different verdicts. Obsolete says the world moved past it: a thing still works, but a newer way has replaced it — the fax machine, the floppy disk. Redundant says it is not needed here and now: a second copy, a duplicated role, something whose job is already being done. Obsolete is out of date; redundant is surplus to requirements.
The two verdicts fall on different things. Obsolete judges a product against its era — from Latin obsolescere, 'to fall into disuse': the object may run perfectly, but the age has outgrown it. Redundant judges a thing against present need — from redundare, 'to overflow': there is more here than the situation requires, so this one is spare. That is why a working typewriter is obsolete but not redundant (nothing duplicates it; the world simply left it), while a second identical pump is redundant but not obsolete (perfectly current, just not needed twice). One is beaten by time, the other by surplus.
obsolete
Obsolete things did not break; the world simply walked past them. The fax machine still faxes, the floppy disk still stores — there is just no one left who needs them to. The word marks the saddest kind of retirement: displacement without failure. Technology becomes obsolete, words become obsolete, skills become obsolete — and the speed at which it happens is itself a favorite subject of exam essays.
redundant
Redundant describes what the system would not miss: the phrase that repeats the sentence, the step that duplicates another, the role made unnecessary by a machine. In British English it is the standard word for losing a job — workers are 'made redundant' when the position, not the person, is abolished. Engineering quietly redeems the word: a redundant system is the deliberate backup that saves the aircraft when the primary fails. Whether redundancy is waste or wisdom depends entirely on what is at stake.
| obsolete | redundant | |
|---|---|---|
| The verdict | out of date — the world moved on | not needed — surplus or duplicated |
| Judged against | its era | present need |
| Still works? | often, yes — that's not the point | yes — it's simply spare |
| Cause | something newer replaced it | something already covers it |
| Typical company | technology, skills, formats | jobs, backups, words, systems |
| Verb it takes | render obsolete | make redundant |
The passed-by wheel and the released twin. The wheel is obsolete: nothing wrong with it, but the age streaks past and stops needing it. The twin node is redundant: perfectly good, simply doubled, so one can drift away with nothing lost. Ask what defeated it. Beaten by something newer: obsolete. Made spare because the job is already covered: redundant. A cassette is obsolete; a spare tyre is redundant until the day it isn't.
obsolete
- iSmartphones rendered standalone satnav units all but obsolete.
- iiThe technique isn't wrong, just obsolete — no lab has used it in twenty years.
- iiiSkills can go obsolete faster than the workers who hold them.
redundant
- iThe merger made half the accounts team redundant.
- iiA second engine is deliberately redundant, there only if the first fails.
- iiiCut every redundant word and the sentence sharpens.
The two do overlap — a role can be made redundant because the task became obsolete — but the verdicts stay distinct, and information management even coordinates them in the acronym ROT: data that is Redundant (duplicated), Obsolete (superseded), or Trivial (never useful). Engineering, meanwhile, prizes redundancy: a redundant backup is a compliment, not a criticism, because being spare is exactly its purpose. British English adds the employment sense — 'made redundant' means laid off because the position, not the person, is no longer needed. Obsolete's finer split from outdated and deprecated lives on the obsolete word page.
The two verbs collocate differently and exams notice: technology and methods are rendered obsolete; posts, staff and components are made redundant. British IELTS listening leans on the employment sense ('two hundred posts were made redundant'), while TOEFL technology readings favour obsolete for superseded systems. In writing, the crisp move is to map role to word — the skill became obsolete, so the role was made redundant — which shows you hold both verdicts at once.