definitionsn.定义名词definition的复数形式.definitionn.定义；阐释；清晰度Definition and quantity概念与规模definition and criteria定义和判据definition-usage path定义一使用路径definitional occurrence定义性出现definition by recursion用递推定义Definition by threshold百分比定义definition of a concept概念界说definition and decision定义与决策definition by statement陈述式定义definition of ecotourism生态旅游定义