exogenous
/ek'sɔdʤinəs/
Definition
- Adjective:
- Derived or originating externally: Describes something that originates from or is caused by factors outside an organism, system, or entity. It is the opposite of endogenous.
Usage
The adjective exogenous is primarily used in scientific and academic contexts, such as biology, economics, medicine, and geology. It describes an external origin or cause. - It typically modifies nouns like factor, variable, shock, substance, or force. - It is often used in contrast to endogenous (originating internally).
Examples
- In Biology/Medicine:
- The patient's fever was caused by an exogenous infection. (The infection came from an external source.)
- Plants can absorb exogenous nutrients from the soil. (The nutrients originate outside the plant.)
- In Economics:
- The economic model included several exogenous variables, such as changes in global oil prices. (These variables are determined by factors outside the model.)
- In General Context:
- The political crisis had an exogenous trigger unrelated to domestic policies. (The trigger came from outside the country.)
Advanced Usage
- Exogenously (adverb): In an externally originating manner.
- The hormone was administered exogenously. (The hormone was introduced from outside the body.)
- Exogeneity (noun): The state or quality of being exogenous.
- The exogeneity of the variable is a key assumption in the analysis.
Variants and Related Words
- Exogenic: A less common synonym, often used in geology.
- Exogenic processes like weathering shape the Earth's surface.
- Endogenous (adjective): The direct antonym, meaning originating from within.
Synonyms
- External
- Extrinsic
- Externally derived
Antonyms
- Endogenous
- Internal
- Intrinsic
Related Phrases/Concepts
- Exogenous variable: (Economics, Statistics) A variable whose value is determined by factors outside the model under consideration.
- Exogenous growth theory: (Economics) A theory that attributes economic growth primarily to external technological progress, not internal factors.
- Exogenous antigen: (Immunology) An antigen that originates from outside the body.
Adjective
-
derived or originating externally
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