Occam's Razor Is Named for What It Cuts Away
A razor is a blade for shaving. In philosophy a razor is a rule that cuts away unnecessary explanations.
A razor is a sharp blade for shaving hair. Philosophy borrowed the word for a rule that shaves away unnecessary assumptions: Occam's razor says that among competing explanations, the one requiring fewest assumptions should be preferred. Others followed the naming pattern — Hanlon's razor, Hitchens's razor — all of them tools for cutting rather than proving. *Razor* comes from Old French *rasor*, from Latin *radere*, to scrape, the same root as *erase* and *abrasive*.
- A shaving blade. *A safety razor.*
- A rule that eliminates. *Occam's razor.*
- Razor-sharp — extremely sharp. *Razor-sharp wit.*
- Razor's edge — a precarious position. *On a razor's edge.*
- Latin — *radere*, to scrape. *The source.*
Word forms
| Form | Word | Example |
|---|---|---|
| Noun | razor | A razor. |
| Plural | razors | Razors. |
| Adjective | razor-sharp | Razor-sharp. |
| Related | erase | Erase. |
| Latin | radere | To scrape. |
- He shaved with a straight razor.Tool.
- Occam's razor favours the simpler account.Philosophy.
- The result was on a razor's edge.Idiom.
Philosophical razors
- Occam's razor — prefer the explanation with fewest assumptions
- Hanlon's razor — never attribute to malice what stupidity explains
- Hitchens's razor — what is asserted without evidence can be dismissed without evidence
- Sagan standard — extraordinary claims require extraordinary evidence
- All are heuristics, not proofs: they guide judgment rather than settle it
Old French *rasor*, from *raser*, to shave, from Latin *radere*, to scrape or shave.
Why is Occam's principle called a razor?
Because it shaves away unnecessary assumptions, leaving the simplest explanation that fits the evidence.
Are razor and erase related?
Yes. Both come from Latin radere, to scrape; to erase is to scrape out.