1 Law:: establish; establish beyond reasonable doubt
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2 Law:: (of a claim, allegation, question) substantiate; verify; ascertain; confirm
3 Law:: (dated, of a piece of writing, instrument, etc) sign and seal and deliver; have sth signed and sealed and delivered; issue under seal; have sth issued under seal
4 Law:: make sure (Confirmation – a conveyance of an estate or right, whereby a voidable estate is made sure and unavoidable or a particular estate is increased – JBSa