Exogenous refers to effects or changes caused by external factors, not internal ones. Excess sun exposure is an exogenous factor that can damage your skin.
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Non-Biological
In general terms, exogenous can mean anything influenced by the environment or other outside sources. Exogenous cultural trends often affect local customs.
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Technical Term
It's a technical term; use it in discussions about science or specialized fields, not casual conversation. Her research focused on exogenous variables affecting climate change.