1. To respond to something in a forced, insincere, or unnatural manner; to give a staged or fake reaction
She reacted artificially to the surprise party, pretending to be more excited than she actually was.
Ela reagiu artificialmente à festa surpresa, fingindo estar mais animada do que realmente estava.
2. In chemistry or physics, to undergo a chemical reaction due to synthetic or man-made conditions rather than natural occurrence
The compound reacted artificially when exposed to the laboratory catalyst.
O composto reagiu artificialmente quando exposto ao catalisador de laboratório.