Grammar Monster
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Craig Shrives
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This page was written by Craig Shrives .
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The plural of thesis is theses, pronounced [thee -seez]. It’s a Greek-derived irregular plural noun that doesn’t follow regular pluralization rules, which add “ -s ” or “ -es ” to the end of the singular to form the plural.
The plural of thesis is not thesises because thesis is an irregular plural noun and doesn’t follow the regular pluralization rules, which add “-s” or “-es” to the end of the singular to form the plural.
Thesis is an irregular plural noun that does not end in the typical -s / -es that regular plural noun forms take. This is so despite that theses plural does in fact end in the conventional -s/-es suffix.
The plural of “thesis” is “theses,” and this is the only correct way to form the plural of this word. On the other hand, when it comes to forming possessive nouns, there are a few …
noun [ C ] us / ˈθi·sɪs / plural theses us / ˈθi·siz / Add to word list. a piece of writing involving original study of a subject, esp. for a college or university degree: a master’s thesis. A thesis …