English Words: U
23,789 words · Page 256 of 476
Of a matrix: such that the entries on the main diagonal of a (upper or lower) triangular matrix are all 1.
A form of trust established by a donor to provide an income stream to a beneficiary, as a percentage of the principal, returning the remainder to the donor when the trust terminates.
The classical unity that states that a play should have one action that it follows, with minimal subplots.
The diachronic process of forming a new single word from a fixed expression of several words.
A form of social security, whereby all citizens or qualified residents, receive a sum of money on a regular schedule unconditionally.
A welfare benefit replacing previous benefits and tax credits, gradually rolled out from 2013 and expected to cover the United Kingdom by the end of 2024.
An American Quaker (Christian) sect (from the 1770s to 1860s), the "Society of Universal Friends", which followed the teachings of the Public Universal Friend.
A hypothetical innate abstract system in the human brain that underlies the grammar of all human languages.
A coupling that allows different parts of a machine not in line with each other some freedom of movement at the same time as transmitting rotary motion. Typical applications include driveshafts and socket wrenches.
A principle whereby a state claims legal jurisdiction over persons whose alleged crimes were committed outside the boundaries of the prosecuting state, regardless of the accused's nationality, country of residence, or other relationship with the prosecuting country.
A logic gate that can be used to re-create the function of all other logic gates.
A mechanism whereby uncountable nouns are made countable by grouping into units.
Spelling & Dictionary Insight
The English alphabetical index for the letter U contains 23,789 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 476 pages, and you are currently viewing page 256. 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 "U" 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.