fixation

(noun) an abnormal state in which development has stopped prematurely. Synonyms: arrested development, infantile fixation, regression.

(noun) an unhealthy and compulsive preoccupation with something or someone. Synonyms: obsession.

(noun) the activity of fastening something firmly in position.

(noun) (histology) the preservation and hardening of a tissue sample to retain as nearly as possible the same relations they had in the living body. Synonyms: fixing.