Intension is analogous to the signified in the Saussurean system, extension to the referent. In logic and semantics, "connotation" is roughly synonymous with "intension". In this way, formal concept analysis formalizes the semantic notions of extension and intension. Neither intension gives us both a necessary and an "a posteriori" component. In the case of a word, the word's definition often implies an intension. Without intension of some sort, a word has no meaning. Customer's purchase intension based on rational expectations, and additionally impacts on emotional trust. For instance, the terms "rantans" or "brillig" have no intension and hence no meaning. Part of its intension is that it has no extension. When considered according to its secondary intension, water means HO in every world. It was the intension to equalise the high number of World War I losses. The Port-Royal introduces the concepts of extension and intension. Class and their members can be defined in OWL either by extension or by intension. The thing picked out by the primary intension of "water" could have been otherwise. The primary intension of "water" might be a description, such as "watery stuff".