In a way that serves as an essential component; as something that fundamentally makes up or establishes something.
From 'constitutive' with the adverbial suffix '-ly.' This creates an adverb used in academic and technical contexts, especially in biology, philosophy, and law.
In genetics, scientists use 'constitutively'—genes are 'constitutively expressed' when they're always turned on, literally building and maintaining the organism without needing to be switched on and off!
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