This document discusses assimilation, which is when a phoneme is realized differently due to the influence of a neighboring phoneme. Assimilation is defined as a sound replacing or changing properties under the influence of an adjacent sound. Consonants and vowels are affected by their neighbors through assimilation. Assimilation can be regressive or progressive and involve place, voice, or manner of articulation. It typically occurs regressively except in suffixes like -s or -ed where it is progressive.

1. FFHA-UNSJ_English Phonetics & Phonology I
The different realization of a phoneme as a result of
being near some other phoneme belonging to a
neighbouring word. (Roach, 2000: 138)
Every consonant and every vowel is affected by its
neighbouring consonants and vowels. This adaptation of
segments to each other is sometimes referred to as
“assimilation” (Brown, 1978: 58)

2. FFHA-UNSJ_English Phonetics & Phonology I
It is often defined as a process of replacing one sound
(or changing some properties of a sound) under the
influence of another sound which occurs near to it. It has
also been characterized as an adjustment of speech
sounds to their environment (cf. Malmberg 1963: 60;
Abercrombie 1967: 133–134; Jones 1972: 217–218)
The process by which sounds are influenced by
neighbouring sounds and come to share some or all of
their phonetic characteristics (Ortiz-Lira, 1982: 77)

3. FFHA-UNSJ_English Phonetics & Phonology I
ASSIMILATION
Allophonic Phonemic Progressive Regressive
Fixed
Voice
(similitude)
Place Place
Voice Manner
Lip position

5. FFHA-UNSJ_English Phonetics & Phonology I
Only regressive
Cf lenis + Ci fortis > fortis
Exception:
-S suffixes, -ED endings (progressive)

6. FFHA-UNSJ_English Phonetics & Phonology I

7. FFHA-UNSJ_English Phonetics & Phonology I

8. FFHA-UNSJ_English Phonetics & Phonology I

9. FFHA-UNSJ_English Phonetics & Phonology I
ONLY IN VERY RAPID COLLOQUIAL SPEECH