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In page Allophone:

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In phonology, an allophone ( ; from the Greek ἄλλος, állos, 'other' and φωνή, phōnē, 'voice, sound') is one of multiple possible spoken sounds – or phones – used to pronounce a single phoneme in a particular language.[1] For example, in English, the voiceless plosive [t] (as in stop [ˈstɒp]) and the aspirated form [tʰ] (as in top [ˈtʰɒp]) are allophones for the phoneme /t/,[citation needed] while these two are considered to be different phonemes in some languages such as Central Thai. Similarly, in Spanish, [d] (as in dolor [doˈloɾ]) and [ð] (as in nada [ˈnaða]) are allophones for the phoneme /d/, while these two are considered to be different phonemes in English (as in the difference between dare and there).