reaction

CEFR: C1-C2 /re-ac-tion/ [r.iy0.ae1.k.sh.ah0.n]

Definition: a reply; a change that occurs when substances are mixed

Example Sentences:

Scientists explore the origins of energy in chemical reactions using experimental quantum chemistry.

Reactions in solids tend to be much more complex than those in liquids, where molecules quickly diffuse into a uniform mixture.