[mass noun](chiefly Philosophy)the inherent nature or essence of someone or something (主哲)(人或事物的)本质,实质 ■[count noun]a distinctive feature; a peculiarity 显著特点;特性,怪癖 his quirks and quiddities. 他的多种怪癖。
语源
late Middle English: from medieval Latin quidditas, from Latin quid 'what'