تسع doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 6 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• تَسَعَهُمْ Form 1

  1 تَسَعَهُمْ سعى تسع تسعهم , aor. تَسَعَ (S, Msb, K) and تَسِعَ (Yoo, Msb, K) and تَسُعَ , (Msb,) inf. n. تَسْعٌ, (T K,) He took the ninth part of their possessions: or he became the ninth of them: (S, Msb, K:) or he mad…

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• تَسْعٌ

  تَسْعٌ سعى تسع وسع : see تِسْعَةٌ.…

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• تُسْعٌ

  تُسْعٌ سعى تسع وسع A ninth part; one of nine parts; (S, Msb, K,) as also ; (Msb;) and , (S, Msb, K,) agreeably with a rule which some hold to be applicable in the case of every similar fractional number; but Sh says, I h…

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• تِسْعٌ

  تِسْعٌ سعى تسع وسع fem. of تِسْعَةٌ, q. v. -b2- Also A certain ظْمء of the أَظْمَآء of camels; (S, K, TA;) i. e., their coming to water [on the ninth day, counting the day of the next preceding watering as the first; or…

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• تُسَعٌ

  تُسَعٌ سعى تسع وسع The seventh and eighth and ninth nights of the [lunar] month; (K;) the three nights of the month which are after the نُفَل, because the last night of these is the ninth; (S;) among the nights of the mo…

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• تُسُعٌ

  تُسُعٌ سعى تسع وسع : see تُسْعٌ.…

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