Phonology

Phonology is the branch of linguistics that studies how sounds function within the system of a particular language. It is concerned not with the physical properties of speech sounds (that is phonetics) but with how sounds are organised, distributed, and contrasted to create meaning.

Phonology vs. Phonetics

	Phonetics	Phonology
Focus	Physical properties of sounds	Functional organisation of sounds
Question	"What sounds are produced?"	"Which sound differences matter?"
Unit	Phone (a physical sound)	Phoneme (an abstract unit of contrast)
Scope	Universal: all human speech sounds	Language-specific: how a particular language uses sounds
Notation	Square brackets: [pʰ]	Slashes: /p/

A phonetician describes the difference between the aspirated [pʰ] in pin and the unaspirated [p] in spin. A phonologist explains that this difference is not contrastive in English, since both are realisations of the same phoneme /p/, but is contrastive in Hindi, where /pʰ/ and /p/ are separate phonemes.

Core Concepts

Phonemes and Allophones

A phoneme is the smallest unit of sound that distinguishes meaning. Changing /p/ to /b/ in English changes pat to bat, so they are different phonemes. An allophone is a predictable variant of a phoneme that does not change meaning. The aspirated [pʰ] and unaspirated [p] in English are allophones of /p/.

Distribution

How sounds are distributed across environments:

• Contrastive distribution: Two sounds occur in the same environment and distinguish meaning → they are separate phonemes. Evidence: minimal pairs (bat/pat, bit/pit).
• Complementary distribution: Two sounds never occur in the same environment; each appears where the other does not, so they are allophones of one phoneme. Example: [pʰ] in syllable-initial position, [p] after /s/.
• Free variation: Two sounds can occur in the same environment without changing meaning, so they are allophones in free variation. Example: released vs. unreleased final stops in English.

Phonotactics

Phonotactics: the rules governing which sequences of phonemes are permitted in a language. English allows /str/ at the start of a word (string) but not /stl/. Japanese does not allow consonant clusters at all. Phonotactic knowledge is part of what makes a speaker sound native, and violations are a major source of foreign accent.

Phonological Rules and Processes

Languages have systematic rules that modify sounds in context:

Process	Description	Example
Assimilation	A sound becomes more like a neighbouring sound	/n/ → [ŋ] before /k/ in think
Elision	A sound is deleted	/t/ lost in mos(t) people
Epenthesis	A sound is inserted	Some speakers add [ə] in film → [fɪləm]
Aspiration	Voiceless stops get a burst of air	[pʰ] in pin
Vowel reduction	Unstressed vowels weaken to schwa	photograph /əʊ/ → photography /ə/

These processes are central to Connected Speech, the way natural spoken English differs from careful, citation-form pronunciation.

Suprasegmental Phonology

Beyond individual segments, phonology encompasses Suprasegmentals, features that operate above the level of the phoneme:

• Stress: Word stress (REcord vs. reCORD), sentence stress
• Intonation: Pitch movement across utterances
• Rhythm: The patterning of stressed and unstressed syllables
• Tone: In tone languages, pitch distinguishes word meaning

Teaching Implications

Pronunciation Teaching

Phonology provides the framework for principled pronunciation teaching. Teachers need to know:

• Which phonemic contrasts cause problems for their learners, based on L1 phonology (see Language Transfer)
• Which phonotactic rules differ between L1 and L2
• How connected speech processes affect intelligibility
• Which suprasegmental features carry the heaviest communicative load (stress and intonation are often more important than individual segments)

Error Analysis

Not all pronunciation errors are equal. Phonological analysis distinguishes:

• Phonemic errors: Confusing two phonemes (/ɪ/ and /iː/, as in ship/sheep); these can cause misunderstanding
• Allophonic errors: Producing a non-standard allophone (unaspirated initial /p/); these sound foreign but rarely cause misunderstanding
• Distributional errors: Violating phonotactic rules (adding vowels to break up clusters: sport → /sɪpɔːt/); these affect intelligibility and naturalness

Materials Design

Understanding phonology helps teachers select and sequence pronunciation targets, choose appropriate Minimal Pair practice, and design activities that address connected speech features systematically.