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American Heritage Dictionary 3rd ed. says it does rhyme with "flat". To be precise, the pronciation is give as "plăt" and the pronuciation key indicates ă sounds like the "a" in "pat". Please supply a citation for your pronunciation. Jc3s5h (talk) 21:29, 20 June 2012 (UTC)
Perhaps it is a regional thing, because I've always heard it said with "a" as in "father" all my life. The pronunciation "plăt" you give would seem to me that of a variant of "plait", meaning "braid". The "plat" of this article is actually a variant of "plot", so it should not be too surprising to hear it pronounced somewhat more like "plot" than "plait". I'm not sure where to find a reference, because regional pronunctions may not be documented anywhere in writing, but I assure you, that's how it's pronounced where I'm from. 22.214.171.124 (talk) 00:30, 21 June 2012 (UTC)
I don't have much occasion to say "plat" out loud, so I don't know how people pronounce it in various regions. I can only go by what I see in sources. But Wikipedia requires citations so that readers can verify information, so only pronunciations for which a reliable source can be found should be included in the article. Jc3s5h (talk) 00:44, 21 June 2012 (UTC)
Probably not sufficient for a reference, but at least someone refers to my pronunciation of "plat" here  so I know it's not all that uncommon around the country. Just like people here say "crick" for "creek" and "tit" for "teat", etc., etc. 126.96.36.199 (talk) 01:14, 21 June 2012 (UTC)