Time Time has long been a major subject of science, philosophy and art. Though dictionaries present some varied definitions of time some of which are presented below , it is difficult to pro..
Money In economics, there are various definitions for money , though it is now commonly considered to be any good or token that fulfills the money functions: to be a medium of exchange, store of v..
Energy In general, the concept of energy refers to "the potential for causing changes". The word is used in several different contexts. The scientific use has a precise, well-defined meaning, whilst..