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simultaneous (adj.) [:] 1650s, from Medieval Latin simultaneus, perhaps from simultim "at the same time," extended from Latin simul "at the same time" (see similar (adj.)), or from simul with ending abstracted from Late Latin spontaneus, where the -t- is organic. [...]

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It means that in spontaneus the t belongs to the root of the word, it's an organic, natural part of that word, while in simultaneus the t and the whole ending -taneous was abstracted from spontaneus and added to the word simul 'together'.

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    Note that talking about "letters" is a category error. The whole discussion is about sounds. – Colin Fine Aug 22 '15 at 1:53
  • In this case, phonemes that are part of morpheme stems, or not. So the root is spont- (ending in /t/) in one case, but simul- in the other. – jlawler Aug 22 '15 at 15:35

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