I don t think we can define anything. Let say, something like an apple. usually, when people try to define a word, it uses other words that group together to form meanings. The general scheme is that someone starts with something specific( it is a fruit, it is round, it has a certain texture) to something general ( atoms, substomic particles ..) 1) we form a is-a relationship. Ex: apple is a fruth. apple is a configuration of some type of atoms. The flaw to me is that we are defining something we dont know with something we believe we know, but we don t know. The second thing about definitions is that nobody agrees with it. we all know that a definition is suppost to "mean" something, but we don t know what all those means is suppost to 'mean'. I thousand people can have a thousand definitions of what the word "love" mean, but those definitions does not tell us anything about the word "love". It is quite obvious to me that a blind person ` s perspection of 'apple' or 'color' is quite different from a non-blind person` s perspective of 'apple' or 'color'. we interpret that which is before us, but what that 'is' before us is anyone s guess. 2) definition are inseparable from individual observers. An apple is a system. we define this system by a set of finited statements. Why must it be finite, and not infinite. A single word that has a infinite, incompressable definition. 3) a single word might be incapable of being expressed. inspite of all this, we still believe we mean what we say when we throw out words. A dictionary is a web of relationships build on a meaningless entities used by meaningless beings.