Meaning of QUANTUM in English

QUANTUM

quan ‧ tum /ˈkwɒntəm $ ˈkwɑːn-/ BrE AmE noun ( plural quanta /-tə/) [countable] technical

[ Date: 1600-1700 ; Language: Latin ; Origin: quantus ; ⇨ ↑ quantity ]

a unit of energy in ↑ nuclear physics

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.