English Words: O
15,494 words · Page 5 of 310
The process of restoring water, soil, and plant life to an environment that has been degraded by soil erosion.
A broad cultural area of pre-Columbian southwestern North America, between Utah and Chihuahua, and bordering the Gulf of California, on the Mexican mainland.
A film or novel depicting adventures of characters in the American Old West; a western.
A solemn pledge or promise that invokes a deity, a ruler, or another entity (not necessarily present) to attest the truth of a statement or sincerity of one's desire to fulfill a contract or promise.
One brought into court to swear to the truth and testify on oath on behalf of the accused, to clear them from suspicion of crime.
Testimony introduced for the purpose of bolstering the credibility of a witness and their testimony, rather than proving or disproving a fact in issue; it is often inadmissible.
A breakfast cereal sold in the United Kingdom, consisting of biscuits of compressed oats.
Spelling & Dictionary Insight
The English alphabetical index for the letter O contains 15,494 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 310 pages, and you are currently viewing page 5. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.
On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.
For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "O" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.