In a way that relates to the chemical processes happening inside living things.
From biochemical (bio- 'life' + chemical 'relating to chemistry') plus -ly adverb suffix. Emerged in early 1900s as biology and chemistry merged into a unified science of life's chemistry.
Every feeling you have—happiness, hunger, tiredness—is actually a biochemical event happening in your brain and body. When someone says 'it's biochemical,' they mean your emotions have a physical, chemical basis, which is why medicines can sometimes help with depression.
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