En fonética, la aspiración es una fuerte explosión de aire que acompaña a la relajación (o el inicio en el caso de la preaspiración) de una obstruyente. El signo diacrítico para denotar la aspiración en el Alfabeto Fonético Internacional (AFI) es un superíndice "h", [ʰ]. Las consonantes no aspiradas normalmente no se marcan explícitamente como tales, aunque existe un diacrítico especial cuando se quiere indicar explícitamente el mediante el diacrítico [⁼].

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In phonetics, aspiration is the strong burst of breath that accompanies either the release or, in the case of preaspiration, the closure of some obstruents. In English, aspirated consonants are allophones in complementary distribution with their unaspirated counterparts, but in some other languages, notably most Indian and East Asian languages, the difference is contrastive. To feel or see the difference between aspirated and unaspirated sounds, one can put a hand or a lit candle in front of one's mouth, and say pin [pʰɪn] and then bin [bɪn]. One should either feel a puff of air or see a flicker of the candle flame with pin that one does not get with bin. In most dialects of English, the initial consonant is aspirated in pin and unaspirated in bin.

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