Core sense — a single act of fornication or adulterygenerated
1he reproached him with two acts of fornication or adultery—قَذَفَهُ بِزِنَيَيْنِ
A single act of الزِّنَى [that is, fornication or adultery].
زِنًى is used in the same sense, though it is properly a maṣdar and not an ism waḥda, as is shown by its being dualized.
They say زِنَيَانِ, but this is post-classical.
Using the dual of زِنًى, the lawyers say this.
he testified, or gave decisive information, about two acts of fornication or adultery—شَهِدَ عَلَى زِنَاءَيْنِ
This is the dual of زِنَآءٌ, properly a maṣdar like زِنًى; another form is زِنَيَيْنِ.
Here, and in the saying before it, the right word is زَنْيَتَيْنِ.
he is a son of fornication or adultery—هُوَ ٱبْنُ زَنْيَةٍ
Sometimes زِنْيَةٍ is said, but the first is the more chaste; the meaning is ٱبْنُ زِنًى.
Or one says هُوَ وَلَدُ زَنْيَةٍ, زِنْيَةٍ, لِزَنْيَةٍ [هُوَ], and لِزِنْيَةٍ, with fetḥ or with kesr, [meaning as above, or وُلِدَ لِزَنْيَةٍ, he is, or was, born of fornication or adultery,] the opposite of وَلَدُ رِشْدَةٍ and لِرِشْدَةٍ, or the opposite of هُوَ لِرِشْدَةٍ.
he is the offspring of fornication or adultery—هُوَ لِزِنْيَةٍ
Also لِزَنْيَةٍ; the opposite of لِرِشْدَةٍ and لِرَشْدَةٍ.
Fr: one says هُوَ لِغَيِّةٍ, لِزَنْيَةٍ, and لِغَيْرِ رَشْدَةٍ, [all meaning the same, and] all with fetḥ.
Ks, however, allows زِنْيَة and رِشْدَة with kesr, but غَيَّة only with fetḥ.
ISk says that زنية and غيّة are used both with kesr and with fetḥ.
Show Lane's original text
A single act of الزِّنَى [i. e. fornication or adultery]: (Msb, TA:) and زِنًى is [used in the same sense, (though properly an inf. n., not of un.,) as is shown by its being] dualized: they say زِنَيَانِ : (TA:) [but this is post-classical:] thus using the dual of زِنًى , the lawyers say, قَذَفَهُ بِزِنَيَيْنِ [He reproached him with two acts of fornication or adultery]: (Msb, TA:) but [in this instance, and] in the saying شَهِدَ عَلَى زِنَاءَيْنِ , [which is dual of زِنَآءٌ , properly an inf. n. like زِنًى ,] or زِنَيَيْنِ , [He testified, or gave decisive information, respecting two acts of fornication or adultery,] the right word is زَنْيَتَيْنِ . (Mgh.) One says also, هُوَ ٱبْنُ زَنْيَةٍ , and sometimes زِنْيَةٍ , (K,) but the former is the more chaste, (Az, TA,) meaning ٱبْنُ زِنًى [i. e. He is a son of fornication or adultery]: (K:) or هُوَ وَلَدُ زَنْيَةٍ and زِنْيَةٍ , (Mgh, Msb,) and لِزَنْيَةٍ [ هُوَ ] and لِزِنْيَةٍ , (Mgh,) with fet-h and with kesr, [meaning as above, or وُلِدَ لِزَنْيَةٍ He is, or was, born of fornication or adultery,] contr. of وَلَدُ رِشْدَةٍ and لِرِشْدَةٍ , (Mgh,) or contr. of هُوَ لِرِشْدَةٍ : (Msb:) or هُوَ لِزِنْيَةٍ and لِزَنْيَةٍ , [He is the offspring of fornication or adultery,] contr. of لِرِشْدَةٍ and لِرَشْدَةٍ : (S:) accord. to Fr, one says, هُوَ لِغَيِّةٍ and لِزَنْيَةٍ and لِغَيْرِ رَشْدَةٍ , [all meaning the same, and] all with fet-h: accord. to Ks, however, one may say زِنْيَة and رِشْدَة , with kesr, but غَيَّة only with fet-h: (TA:) ISk says that زنية and غيّة are both with kesr and fet-h. (Msb.)