What's the plural of thesis?

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I thought that the plural of thesis was theses, but I've seen both forms (thesis and theses) for the plural. Which is the correct one then?

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Junior Member54
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It should be "theses"
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Or, thesis' if you are saying that something belongs to a particular thesis.
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actually when i had checked it was theses so your thought was right

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Then in that case it is not plural!!!
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I had a look here: http://www.askoxford.com/concise_oed/thesis?view=uk

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the plural of thesis is theses
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noun (pl. theses /theeseez/) 1 a statement or theory put forward to be maintained or proved. 2 a long essay or dissertation involving personal research, written as part of a university degree.
— ORIGIN Greek, ‘placing, a proposition’.

Austin Charles- UNIS
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Anonymous Or, thesis' if you are saying that something belongs to a particular thesis.

You are referring to the possessive, not the plural.
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