adjective ul·tro·ne·ous \ˌəlˈtrōnēəs\

Definition of ultroneous

Scots law

  1. :  that voluntarily offers testimony without being cited an ultroneous witness

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Origin and Etymology of ultroneous

Latin ultroneus voluntary, spontaneous, from ultro beyond, beyond expectation, spontaneously, from ablative singular masculine or neuter of (assumed) ulter situated beyond — more at ulterior

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