تاسوعآء doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• تَاسُوعَآءُ

  تَاسُوعَآءُ تاسوعآء , (Msb, TA, &c.,) or التَّاسُوعَآءُ, (S, K,) The tenth day of [the month] El-Moharram; (Msb, TA;) [the day] before the day of العَاشُورَآءُ, (S,) or before the day of عَاشُورَآءُ: (K:) or, accord…

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