Abstract
Not few suggestions have ever been made on the definition of "information". But most of them are given with multi-levels-meanings. It must be defined to cover the whole spectrum of meanings by a single phase. Considering a similarity among "time", possibility" and "information" in the aspect of difficulty to define their essence, the author introduced a new concept of anti-information" which is equal to possibility. The anti-information is considered to be "con-formed" to the existence to be " in-formed". Some parts of anti-information turns out to be information.＜br/＞
This hypothesis enhances the significance of information, making the concept of Norbert Wiener that the whole world is consisted of material, energy and information more meaningful.
