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I
- I (pronoun)First-person singular personal pronoun
- Ian MaddiesonBritish-American linguist (1942–2025)
- Icelandic languageNorth Germanic language
- Icelandic phonologySounds and pronunciation of Icelandic
- IconicityAspect of linguistics and semiotics
- IdiolectIndividual's unique use of language
- IdiomPhrase with a non-literal meaning
- IEEE styleThe Institute of Electrical and Electronics Engineers (IEEE) style is a widely accepted fo
- ImerkheviansImerkhevians (Georgian: იმერხეველები), are an ethnographic subgroup of Georgians who speak
- Imperative moodGrammatical mood
- ImperfectGrammatical construct combining past tense with continuing aspect
- Imperfective aspectGrammatical aspect of continuity or repetition
- Impersonal passive voiceVerb voice that decreases the valency of an intransitive verb
- ImplicatureInformation conveyed verbally yet not literally
- In the Land of Invented Languages2009 book by Arika Okrent
- Inalienable possessionGrammatical category
- Incorporation (linguistics)When a grammatical category forms a compound while retaining original syntactic function
- Indefinite pronounPronoun without a definite referent
- Independent readingIndependent reading is a term used in educational settings, where students are involved in
- IndexicalitySign pointing to or indexing an object in its context
- Indigenous languageLanguage that is native to a region and spoken by Indigenous peoples
- Indigenous languages of the AmericasThe indigenous languages of the Americas are the languages that were used by the Indigenou
- Individual variation in second-language acquisitionDifferences in language-learning success
- Indo-European ablautGrammatical change of vowels in Indo-European languages
- Indo-European studiesSubfield of linguistics
- Indo-European thematic vowelConcept in Indo-European linguistics
- InfinitiveGrammatical form
- InfixAffix inserted inside a word stem
- InflectionProcess of word formation, by alteration to express grammatical categories
- Influences on the Spanish languageSpanish is a Romance language which developed from Vulgar Latin in central areas of the Ib
- Information structureWay in which information is formally packaged within a sentence
- Inherently funny wordWords which have been described as inherently funny
- Inland Northern American EnglishDialect spoken in the Great Lakes region
- InnuendoSuggestive remark
- Input hypothesisHypotheses of second-language acquisition
- Institute for Catalan StudiesCatalan academic institution
- Institute of Linguistics of the Russian Academy of SciencesThe Institute of Linguistics of the Russian Academy of Sciences (Russian: Институт языкозн
- Instrumental caseGrammatical case
- Insular Celtic languagesGroup of Celtic languages of Brittany, Great Britain, Ireland, and the Isle of Man
- IntensifierLinguistic modifier which enhances the word it modifies
- Intensional logicApproach to predicate logic
- Interaction hypothesisIdea that second-language acquisition is helped by face-to-face communication
- Interactional linguisticsUsage-based approach to linguistic structures
- Interdental consonantInterdental consonants are produced by placing the tip of the tongue between the upper and
- InterdiscourseImplicit or explicit relations that a discourse has to other discourses
- Interface positionSecond language acquisition concept
- InterfixType of affix
- InterlanguageIdiolect used by a second language learner
- InterlinguaConstructed language
- InterlinguisticsSubfield of linguistics
- Interlocutor (linguistics)Person involved in a conversation or dialogue
- International Association of Applied LinguisticsFrench association for applied linguistics
- International auxiliary languageConstructed language meant to facilitate communication
- International Computer Archive of Modern and Medieval EnglishThe International Computer Archive of Modern and Medieval English (ICAME) is an internatio
- International Linguistics OlympiadSecondary student science competition
- International Mother Language DayAnnual observance to promote awareness of linguistic and cultural diversity
- International Phonetic Alphabet chartPhonetic symbol chart
- Internet linguisticsDomain of linguistics
- Interpersonal communicationExchange of information among people
- Interrogative wordWords that indicate a question is being asked, as a grammatical category
- Intersective modifierIn linguistics, an intersective modifier is an expression which modifies another by delive
- Intonation (linguistics)Variation in pitch
- Intransitive verbVerb that does not entail a direct object
- Inverted breveInverted breve or arch is a diacritical mark, shaped like the top half of a circle ( ̑ ),
- IPA BrailleBraille encoding of the International Phonetic Alphabet
- IPA numberNumbering system for alphabetical symbols
- Iranian peoplesGroup of Indo-European peoples
- Irish grammarGrammar of the Irish language
- Irrealis moodGrammatical mood
- IsochronyRhythmic division of time in spoken language
- IsoglossAn isogloss, also called a heterogloss, is the geographic boundary of a certain linguistic
- Isolating languageLanguage with a very low morpheme per word ratio
- Isotopy (semiotics)Concept in Semiotics
- ISSNSerial number used to identify a periodical publication