elsewhere condition: 一般指 allophone 即音素变体或音位变体中确定语素morpheme的条件或方法。
English speakers may be unaware of the differences among six allophones of the phoneme /t/, namely unreleased [ t̚] as in cat, aspirated [tʰ] as in top, glottalized [ʔ] as in button, flapped [ɾ] as in American English water, nasalized flapped as in winter, and none of the above [t] as in stop. However, they may become aware of the differences if, for example, they contrast the pronunciations of the following words:
Night rate: unreleased [ˈnʌɪt̚.ɹʷeɪt̚] (without word space between . and ɹ)Nitrate: aspirated [ˈnaɪ.tʰɹ̥eɪt̚] or retracted [ˈnaɪ.tʃɹʷeɪt̚]
举个例子，英语中语素/t/有6种音素变体，只有研究语音学的专家才有可能分辨，在单字cat中/t/发弱音，在单字top中发气音，在button中发喉音，在winter中发鼻音，而在美式发音water中/t/根本就不发音！还有一种特殊发音就是单字stop，音素/t/和/o/放在一起发一个音。
通过lsewhere condition确定音素变体中morpheme主要依靠语境context，在单字Night rate和Nitrate中的甄别位置条件是第一个/t/发弱音而第二个一定发气音，
Night rate-[nait reit]；Nitrate-[ˈnaɪtreɪt]