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O
- Object (grammar)Grammatical concept
- Object–subject word orderType of word order
- Object–subject–verb word orderLanguage classification
- Object–verb word orderIn linguistics, an OV language (object–verb language), or a language with object-verb word
- Object–verb–subject word orderRare permutation of word order
- Obligatory contour principlePhonological constraint
- ObviativeWithin linguistics, obviative (abbreviated OBV) third person is a grammatical-person marki
- OCLCGlobal library cooperative
- Official bilingualism in CanadaThe official languages of Canada are English and French, which "have equality of status an
- Official languageLanguage given special status in a country or territory
- OfficialeseLanguage that sounds official
- Old IrishOldest widely attested Gaelic language
- Old National PronunciationThe Old National Pronunciation (traditional Chinese: 老國音; simplified Chinese: 老国音; pinyin:
- Old Saxon grammarThe grammar of Old Saxon is highly inflected, similar to that of Old English or Latin. As
- On Denoting"On Denoting" is an essay by Bertrand Russell. It was published in the philosophy journal
- OnomasiologyBranch of linguistics concerned with how to express a given concept
- OnomasticsStudy of proper names
- OnomatopoeiaWords that imitate the sound they describe
- Open back rounded vowelVowel sound represented by ⟨ɒ⟩ in IPA
- Open back unrounded vowelVowel sound represented by ⟨ɑ⟩ in IPA
- Open central unrounded vowelVowel sound often represented by ⟨ä⟩ in IPA
- Open front rounded vowelVowel sound represented by ⟨ɶ⟩ in IPA
- Open front unrounded vowelVowel sound represented by ⟨a⟩ in IPA
- Open vowelAn open vowel is a vowel sound in which the tongue is positioned approximately as far as p
- Open-mid back rounded vowelVowel sound represented by ⟨ɔ⟩ in IPA
- Open-mid back unrounded vowelVowel sound represented by ⟨ʌ⟩ in IPA
- Open-mid central rounded vowelVowel sound represented by ⟨ɞ⟩ in IPA
- Open-mid central unrounded vowelVowel sound represented by ⟨ɜ⟩ in IPA
- Open-mid front rounded vowelVowel sound represented by ⟨œ⟩ in IPA
- Open-mid front unrounded vowelVowel sound represented by ⟨ɛ⟩ in IPA
- Open-mid vowelAn open-mid vowel (also mid-open vowel, low-mid vowel, mid-low vowel or half-open vowel) i
- Optative moodThe optative mood ( OP-tə-tiv or op-TAY-tiv; abbreviated OPT) is a grammatical mood that i
- Ordinal numeralWord representing the position or rank in a sequential order
- Ormulum12th century English book of homilies
- OrthoepyOrthoepy is the study of pronunciation of a particular language, within a specific oral tr
- Ossi and WessiNames for former East and West German citizens
- Oswald SzemerényiHungarian-British linguist (1913–1996)
- Ottawa Valley EnglishOttawa Valley English is Canadian English of the Ottawa Valley, particularly in reference
- Otto JespersenDanish linguist (1860–1943)
- Ough (orthography)Tetragraph in English
- OxymoronFigure of speech