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certifiable (adj.)
1846, "capable of being declared as true," from certify + -able. Meaning "so deranged as to be certifiably insane" is recorded from 1870, from certify in the specific sense "officially declare (someone) to be insane" (1822). The certification was done by local officials, later medical officers, and often included a statement as to whether the person was harmless or dangerous, curable or incurable.
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Definitions of certifiable from WordNet
Dictionary entries near certifiable
cert
certain
certainly
certainty
certes
certifiable
certificate
certificated
certification
certified
certify