The Vietnamese word "kết tinh" refers to the process of crystallization. It is used primarily in scientific contexts, particularly in chemistry and cooking, to describe when a substance forms solid crystals from a liquid solution.
While "kết tinh" is primarily used to mean crystallization, in a broader sense, it can also imply the idea of something becoming more pure or concentrated. For instance, in a metaphorical sense, someone might say their thoughts are "kết tinh" after reflecting deeply.