The glass, the glassy state and the Alice number

In the present contribution a critical discussion is made, on the basis of the different definitions of the terms glass and glassy state. Some new refined versions of these definitions are proposed. Special attention is paid to the characterisation of the kinetic frozen state. A new freezing-in criterion, proposed to be called Alice number is introduced. This criterion is used to characterise the kinetic freezing process as well as the kinetic frozen state.