Words / A / Medicine

affinity

/əˈfɪnɪti/

B2CEFR level
50/100Rarity: uncommon
TechnicalRegister

Medicine noun

The strength with which a drug binds to its receptor.

The antagonist's high affinity for the receptor allows it to outcompete the endogenous agonist.

Topic: Pharmacology in Medical English

Business noun

A customer's felt sense of kinship with a brand beyond mere satisfaction.

Loyalty programs reward transactions, but affinity is what survives a price hike.

Similar: rapport, kinship

Topic: Marketing & brand in Business English

Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.

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More medicine words: Pharmacology