The smallest bit of something which can possibly exist. For example, light energy comes in quanta which are known as photons, and can be thought of as particles of light. You cannot have an amount of light more than nothing but less than one photon.
To use the phrase 'quantum leap' as a monumental jump is extremely funny when you realize that a quantum anything would be the smallest thing imaginable.
A good band that sounds kinda like green day but a little heavier at times. They are very political and always singing about good stuff not breaking up with a girlfriend like most bands do these days. they sing about how the government is screwing them over because the dont want to be conformists and how its not fair people are rich for no reason and attack status symbols and populatity. The are anti-capitalism and pro anarchy (I think) and want to help the poor and stuff like that. Such nice guys.
A quantum is a unit of energy in regards to atoms. More specifically, a quantum is an electron shell surrounding the nucleus of an atom. Larger atoms (those located further down the periodic table) have more electron shells, each of which is known as a quantum.
The valence electrons of lithium (Li) are in the 2nd quantum, while the valence electrons of sodium (Na) are in the 3rd quantum.