I was wondering why nation is pronounced nay-shun and national is pronounced nah-shu-nal. My question relates to the difference between pronouncing "Nay" and "Nah". The spelling of "nation" in "national" is the same as "nation", but the "na" parts of the word are pronounced differently. Is there some kind of rule or pattern for this?
There isn't a pattern or rule; nation/national is unique. Of all -ational words, only national and rational are pronounced with /ˈæʃən/ (rhymes with "ashen"). Ration/rational, however, is usually consistently /'ræʃən/ and /'ræʃənl/ (or /ˈreɪʃən/ and /ˈreɪʃənl/, though sometimes, as Peter Shor points out, /ˈreɪʃən/ is paired with /'ræʃənl/, using the same respective pronunciations as nation/national), even though the two terms are not closely related in meaning. National is therefore an oddball, being pronounced /ˈnæʃənl/ when nation is (as normal -ation words are) pronounced /ˈneɪʃən/.
I don't think anyone knows exactly why national isn't pronounced /ˈneɪʃənl/ like all the other -ational words.
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