Meaning of QUANTUM in English

QUANTUM

/kwon"teuhm/ , n. , pl. quanta /-teuh/ , adj.

n.

1. quantity or amount: the least quantum of evidence.

2. a particular amount.

3. a share or portion.

4. a large quantity; bulk.

5. Physics.

a. the smallest quantity of radiant energy, equal to Planck's constant times the frequency of the associated radiation.

b. the fundamental unit of a quantized physical magnitude, as angular momentum.

adj.

6. sudden and significant: a quantum increase in productivity.

[ 1610-20; n. use of neut. of L quantus how much ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .