A borrowing, ultimately from Latin effectus (“an effect, tendency, purpose”) (from efficiō (“to accomplish, to complete”)), probably via some other European language.

efekts m (1st declension)

1. effect (result, consequence, action or state generated by some cause; vivid impression)

   gaismas, skaņu, krāsu efekts ― light, sound, color effect

   ārējs efekts ― external effect

   ekonomisks efekts ― economic effect

   psiholoģisks, terapeitisks efekts ― psychological, therapeutical effect