Noun

(uncountable) The condition of being weak.

(countable) An inadequate quality; fault

* {{quote-book, year=1963, author=(Margery Allingham), title=(The China Governess)

, chapter=20 citation , passage=The story struck the depressingly familiar note with which true stories ring in the tried ears of experienced policemen. No one queried it. It was in the classic pattern of human weakness , mean and embarrassing and sad.}}

* {{quote-news, year=2013, date=January 22, author=Phil McNulty, work=BBC

, title= Aston Villa 2-1 Bradford (3-4) , passage=Bradford had preyed on Villa's inability to defend set pieces, corners in particular, in their first-leg win and took advantage of the weakness again as Hanson equalised to restore their two-goal aggregate lead.}}

(countable) A special fondness or desire.

Noun

(wikipedia affinity) (affinities)

A natural attraction or feeling of kinship to a person or thing.

A family relationship through marriage of a relative (e.g. sister-in-law), as opposed to consanguinity. (e.g. sister).

A kinsman or kinswoman of such relationship. Affinal kinsman or kinswoman.

The fact of and manner in which something is related to another.

* 1997 , Chris Horrocks, Introducing Foucault'', page 67, ''The Renaissance Episteme (Totem Books, Icon Books; ISBN 1840460865):

A “signature” was placed on all things by God to indicate their affinities' — but it was hidden, hence the search for arcane knowledge. Knowing was '''guessing''' and ' interpreting , not observing or demonstrating.

Any romantic relationship.

Any passionate love for something.

(taxonomy) resemblances between biological populations; resemblances that suggest that they are of a common origin, type or stock.

(geology) structural resemblances between minerals; resemblances that suggest that they are of a common origin or type.

(chemistry) An attractive force between atoms, or groups of atoms, that contributes towards their forming bonds

(medicine) The attraction between an antibody and an antigen

(computing) tendency to keep a task running on the same processor in a symmetric multiprocessing operating system to reduce the frequency of cache misses

(geometry) An automorphism of affine space.