1648, in the meaning defined above
borrowed from Latin adnātus, agnātus, past participle of adnāscī, agnāscī "to be born in addition (to), grow later, grow as an addition (to)" — more at agnate entry 1
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“Adnate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/adnate. Accessed 18 Jan. 2022.
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