Antimatter

Definitions

1. Matter that is composed of the antiparticles of those that constitute normal matter.
   uncountable, usually
2. A form of matter that has a key property, such as charge, opposite to that of ordinary matter.
   uncountable, usually

Equivalents

Examples

“But most theories predict⟳ that equal amounts of matter⟳ and antimatter should have⟳ been produced during the big bang, and the mystery of what happened to all the antimatter is a central question⟳ in fundamental physics.”

“Particles of matter⟳ and antimatter are identical, except for an opposite electrical charge. An electron has a negative charge whereas its antiparticle, the positron, has a positive charge, and both have⟳ an identical mass.”

CEFR level