English Words: U
23,789 words · Page 231 of 476
The principle and practice of having a legislative body consisting of a single chamber.
Being the transmission of messages to a single destination host on a packet switching network.
An agency of the United Nations responsible for providing humanitarian and developmental aid to children worldwide.
A receptor that has only a haptophore group or a haptophore and a zymophore group, but no complementophile group.
Of a Markov chain, consisting of a single recurrent class plus a possibly empty set of transient states.
A series of character encoding standards intended to support the characters used by a large number of the world’s languages.
Of a topological space X: such that it is a connected space and, for any closed, connected A,B⊂X with X=A∪B, the intersection A∩B is connected.
A mountain range in the southern Appalachians, along the border between Tennessee and North Carolina; since 1932 defined as the southern segment (south of the Little Tennessee River, and north of the Hiwassee River) of a range the northern segment of which is known as the Unakas (historically the two names sometimes interchangeably designated the whole range).
A social structure of ants in which the workers can move freely between different nests.
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 231. 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.