Entry 1 sense Webster, 1913 Improperation · Im·prop·er·a·tion · IPA 01 n. The act of upbraiding or taunting; a reproach; a taunt. 1. The act of upbraiding or taunting; a reproach; a taunt.[Obs.] “Improperatios and terms of scurrility.” — Sir T. Browne