the act of fixing or the state of being fixed.

Chemistry .

reduction from a volatile or fluid to a stable or solid form.

the process of converting atmospheric nitrogen into a useful compound, as a nitrate fertilizer.

Photography . the process of rendering an image permanent by removal of light-sensitive silver halides.

Psychoanalysis . a partial arrest of emotional and instinctual development at an early point in life, due to a severe traumatic experience or an overwhelming gratification.

a preoccupation with one subject, issue, etc.; obsession

All her life she had a fixation on stories of violent death.

noun

addiction , case , complex , craze , crush , fascination , fetish , hang-up * , ide fixe , infatuation , mania , preoccupation , thing , obsession , quirk