تسنهت 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.

• تَسَنَّهْتُ Form 5

  5 تَسَنَّهْتُ عِنْدَهُ ذ , (S,) and تَسَنَّيْتُ عنده, (S, Msb,) I remained, stayed, dwelt, or abode, with him, or at his abode, a year: (Msb:) both signify the same. (TA.) [See also 5 in art. سنو and سنى.] -b2- تسنّهت ال…

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