sɪˈlɛɹɪti ˈdɛftnəs fəˈsɪlɪti ˈkwɪknəs ɹəˈpɪdɪti ˈspiːdinəs a rate that is rapid intelligence as revealed by an ability to give correct responses without delay skillful performance or ability without difficulty his quick adeptness was a product of good design he was famous for his facility as an archer