noun

1. a fixing, or fixating, or a being fixed, or fixated; specif.,
   1. the directing and focusing of the eyes
   2. popularly an exaggerated preoccupation; obsession
2. Chem.
   1. reduction into a solid, permanent, or nonvolatile form
   2. nitrogen fixation
3. Photog. the treatment of a film, print, etc. to make it permanent
4. Psychoanalysis an arrest of the expression of the libidinal or aggressive drive at an early stage of psychosexual development, or a persistent attachment to some object or person that derives from this

Etymology: ME fixacioun < ML fixatio < fixatus: see fixate