Entry 2 senses · 2 variants Webster, 1913 Corroborative /(k?r-r?b"?-r?-t?v)/ · Cor·rob·o·ra·tive · IPA /kərˈɑbərətˌɪv/ a. n. 01 a. Tending to strengthen of confirm. 1. Tending to strengthen of confirm. 02 n. A medicine that strengthens; a corroborant. 1. A medicine that strengthens; a corroborant.