The International Phonetic Alphabet

The International Phonetic Alphabet (IPA) is a standardized system of symbols for representing the sounds of spoken language, with one symbol corresponding to each distinct speech sound.

Definition

A standardized, internationally recognized set of symbols and diacritics for transcribing the speech sounds of any spoken language.

Scope

This topic describes the IPA as maintained by the International Phonetic Association: its principles, its charts for pulmonic and non-pulmonic consonants and for vowels, and its diacritics for marking finer articulatory and prosodic detail. It distinguishes broad (phonemic) from narrow (phonetic) transcription and explains the use of slashes and square brackets. The IPA serves as a shared notation across phonetics, phonology, dialectology, language teaching, and speech sciences. The treatment is descriptive and reference-oriented.

Core questions

• What principles govern the design of the IPA?
• How are consonants and vowels organized in the IPA charts?
• What is the difference between broad and narrow transcription?
• How do diacritics extend the basic symbol set?

Key theories

One symbol per sound principle

The foundational design principle that each distinctive speech sound should have a single, consistent symbol, enabling unambiguous cross-linguistic transcription independent of any language's orthography.

History

The alphabet originated in 1888 with the International Phonetic Association, founded by Paul Passy and colleagues, and has been periodically revised, with a major restructuring in the Kiel Convention of 1989 reflected in the 1999 Handbook. It grew out of efforts to provide a consistent notation for language teaching and scientific description.

Debates

Coverage and revision of the chart

The Association periodically debates whether to add, remove, or relocate symbols as new sounds are documented or reanalyzed, balancing comprehensiveness against stability of the notation.

Key figures

• Paul Passy
• Daniel Jones
• Geoffrey Pullum
• Peter Ladefoged

Seminal works

• ipa1999
• pullum1996

Frequently asked questions

Why do linguists use the IPA instead of ordinary spelling?

Ordinary spelling is inconsistent and language-specific; the IPA assigns one symbol to each distinct sound so that pronunciations can be recorded and compared accurately across languages and dialects.

What do slashes and square brackets mean in transcription?

Slashes enclose a broad, phonemic transcription that records contrastive sounds, while square brackets enclose a narrow, phonetic transcription that records fine articulatory detail.