ប្រតិកម្ម (Khmer) comes from Sanskrit प्रति, from Pali kamma, from Sanskrit कर्मन्, from Proto-Indo-Aryan kárma, from Proto-Indo-Iranian kárma, from Proto-Indo-European kʷer- — to do; to make; to build.
ប្រតិកម្ម (Khmer): reaction, counteraction