زنية doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• زَنْيَةٌ

  زَنْيَةٌ ذ A single act of الزِّنَى [i. e. fornication or adultery]: (Msb, TA:) and 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…

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• زِنْيَةٌ

  زِنْيَةٌ ذ [accord. to analogy signifies A mode, or manner, of fornication or adultery]. See the next preceding paragraph, in five places. -A2- Also The last of a man's children; (K;) like as فِجْرَةٌ signifies the “ las…

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