Raising (phonetics)

Main article: Raised and lowered

Sound change and alternation
Metathesis Quantitative metathesis
Lenition Consonant gradation Consonant voicing and devoicing Assibilation L-vocalization Debuccalization
Fortition
Epenthesis Prothesis Paragoge Unpacking Vowel breaking
Elision Apheresis Syncope Apocope Haplology Cluster reduction
Cheshirization Compensatory lengthening Nasalization Tonogenesis Floating tone
Assimilation Fusion Coarticulation Palatalization Velarization Labialization Final devoicing Metaphony (vowel harmony, umlaut) Consonant harmony
Dissimilation
Sandhi Liaison, linking R Consonant mutation Tone sandhi Hiatus Synalepha  Elision Crasis Synaeresis and diaeresis Synizesis
Other types Clipping Fronting Raising Iotacism Lambdacism Relaxed pronunciation Rhotacism Rhinoglottophilia Sulcalization Shm-reduplication

In phonology and phonetics, raising is a sound change in which a vowel or consonant becomes higher or raised, meaning that the tongue becomes more elevated or positioned closer to the roof of the mouth than before. The opposite effect is known as lowering. Raising or lowering may be triggered by a nearby sound, in which case they are a form of assimilation, or they may occur on their own.

In i-mutation, a front vowel is raised before /i/ or /j/. This is assimilation.

In the Attic dialect of Ancient Greek and in Koine Greek, close-mid /eː oː/ were raised to /iː uː/. This change occurred in all cases and was not triggered by a nearby front consonant or vowel. Later, Ancient Greek /ɛː/ was raised to become Koine Greek [eː] and then [iː]. For more information, see Ancient Greek phonology § Vowel raising and fronting

In Czech, the alveolar trill /r/ was raised before /i/ to become the raised alveolar trill /r̝/, spelled ⟨ř⟩ as in ⟨Dvořák⟩. This is a form of palatalization. In Polish, /r/ was also palatalized, but instead became the voiced retroflex sibilant /ʐ/, spelled ⟨rz⟩.