affinity

American  

[uh-fin-i-tee] / əˈfɪn ɪ ti /

noun

affinities plural

1. a natural liking for or attraction to a person, thing, idea, etc.

   Synonyms:

   bent, leaning, sympathy, fondness, partiality

   Antonyms:

   aversion, dislike

2. a person, thing, idea, etc., for which such a natural liking or attraction is felt.

3. relationship by marriage or by ties other than those of blood (distinguished from consanguinity).

4. inherent likeness or agreement; close resemblance or connection.

   Synonyms:

   compatible, similarity

   Antonyms:

   disparity, dissimilarity

5. Biology. the phylogenetic relationship between two organisms or groups of organisms resulting in a resemblance in general plan or structure, or in the essential structural parts.

6. Chemistry. the force by which atoms are held together in chemical compounds.

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adjective

1. of or relating to persons who share the same interests.

   to arrange charter flights for opera lovers and other affinity groups.

affinity British  

/ əˈfɪnɪtɪ /

noun

1. a natural liking, taste, or inclination towards a person or thing

2. the person or thing so liked

3. a close similarity in appearance or quality; inherent likeness

4. relationship by marriage or by ties other than of blood, as by adoption Compare consanguinity

5. similarity in structure, form, etc, between different animals, plants, or languages

6. chem

   1. the tendency for two substances to combine; chemical attraction

   2.  A.  a measure of the tendency of a chemical reaction to take place expressed in terms of the free energy change

7. biology a measure of the degree of interaction between two molecules, such as an antigen and antibody or a hormone and its receptor

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affinity Scientific  

/ ə-fĭn′ĭ-tē /

1. A relationship or resemblance in structure between species that suggests a common origin.

2. An attraction or force between particles that causes them to combine, as the attraction between an antigen and an antibody.

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Other Word Forms

Derived Forms

• nonaffinity
  noun
• affinitive
  adjective

Inflected Forms

Nouns

• affinities
  plural

Etymology

Origin of affinity

First recorded in 1275–1325; Middle English affinite, from Middle French, from Latin affīnitās “connection by marriage”; equivalent to affine + -ity

Explanation

If you get along with someone very well, you have an affinity with them. Sometimes opposites attract, so you might feel a strange affinity to someone who is seemingly very different from you. When you are attracted to someone or something a great deal, we say that you have an affinity, a natural connection. Likewise, scientists use affinity to describe organisms that are alike or resemble each other. Interestingly, the Middle English word, affinite, originally applied to people who were connected or related by marriage, rather than by biology.

Example Sentences

See Examples For:

affinity affinities

Notching his first major-league hit at Yankee Stadium was even sweeter, Alfonzo said, because of his grandmother’s affinity for the Yankees.

From Los Angeles Times ● Jul. 20, 2026

This past school year, Lee’s affinity for finance secured him a spot as the youngest member on his high school’s personal-finance team.

From The Wall Street Journal ● Jul. 11, 2026

But affinity with his home country meant there was little chance of that happening, even if it meant the chances of winning something at international level - or even regularly reaching tournaments - were slim.

From BBC ● Jul. 10, 2026

At this point in his public arc, his affinity for the material is more like a colonizing claim.

From Slate ● Jun. 11, 2026

I’d thought, based on his affinity for all things horror, he’d have black walls and a red bedspread.

From "From Twinkle, with Love" by Sandhya Menon

Against the backdrop of the impending presidential election—cue laughter at references to Hillary Clinton’s inevitable win—their affinities and hopes emerge and diverge.

From The Wall Street Journal ● Jul. 2, 2026

But the non-college-educated voters who have traditionally been his bedrock supporters are facing so much financial strain these days that his cultural affinities, even when they’re somewhat authentic, just don’t cut it.

From Salon ● Jun. 16, 2026

Kurds, while mostly Sunni, share cultural and linguistic affinities with Persians and have historically had less friction with the Iranian state than with fellow Kurds in Iraq and Turkey.

From Barron's ● Mar. 5, 2026

What joined them together, I think, were kind of dark affinities.

From Los Angeles Times ● Dec. 10, 2024

Thus copper sits on top of silver and silver sits on top of gold because of their chemical affinities as metals, while helium, neon, and argon are in a column made up of gases.

From "A Short History of Nearly Everything" by Bill Bryson

Related Words

• affection
• closeness
• fondness
• leaning
• rapport
• sympathy
• weakness