Meaning of QUANTUM in English

QUANTUM

I. ˈkwän-təm noun

( plural quan·ta ˈkwän-tə)

Etymology: Latin, neuter of quantus how much

Date: 1567

1.

a. : quantity , amount

b. : portion , part

c. : gross quantity : bulk

2.

a. : any of the very small increments or parcels into which many forms of energy are subdivided

b. : any of the small subdivisions of a quantized physical magnitude (as magnetic moment)

II. adjective

Date: 1942

1. : large , significant

a quantum improvement

2. : of, relating to, or employing the principles of quantum mechanics

quantum physics

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.