[EDLING:247] phonology question

[sicola at DOLPHIN.UPENN.EDU]

WHY is the 'ti' in "equation"  pronounced as a voiced alveopalatal
fricative, and every other 'tion' I can think of is pronounced as a
voiceless one? - relation to an odd verb?  (equate-equation, but relate-
relation)   Syllable containing [wey] before the 'tion?"  I can't think of
another word with that vowel structure. Historical changes? Other?


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