Intonation, in linguistics, is the variation of pitch when speaking. Intonation and stress are two main elements of linguistic prosody.
Many languages use pitch syntactically, for instance to convey surprise and irony or to change a statement to a question. Such languages are called intonation languages. English is a well-known example. Some languages use pitch to distinguish words; these are known as tonal languages. Thai is an example. An intermediate position is occupied by languages with tonal word accent, for instance Norwegian.
Rising intonation means the pitch of the voice increases over time; falling intonation means that the pitch decreases with time. A dipping intonation falls and then rises, whereas a peaking intonation rises and then falls.
The classic example of intonation is the question/statement distinction. For example, northeastern American English has a rising intonation for echo or declarative questions (He found it on the street?), and a falling intonation for wh- questions and statements. Yes/no questions often have a rising end, but not always. The Chickasaw language has the opposite pattern, rising for statements and falling with questions.
Dialects of British and Irish English vary substantially (Grabe 2004,[1]), with rises on many statements in urban Belfast, and falls on most questions in urban Leeds.
In the International Phonetic Alphabet, "global" rising and falling intonation are marked with a diagonal arrow rising left-to-right [↗] and falling left-to-right [↘], respectively. These may be written as part of a syllable, or separated with a space when they have a broader scope:
In the previous example, the global rise symbol is placed between the transcriptions for the words "the" and "street".
In that example, the symbol for a global fall was placed before the transcription for the word "yes," as well as between the transcriptions for the words "the" and "street".
Here, the global rise symbol is place before the transcription for the word "how" and the global fall symbol is placed between the two syllables in "escape", after the small capital letter "I" which represents the sound [ɪ].