(also + on/with) an attachment to or preoccupation with (somebody or something), esp if obsessive or unhealthy
develop a fixation on one's boss
His one fixation was neatness
a mother-fixation
a concentration of the libido on infantile forms of gratification
fixation at the oral stage
concentration of the gaze on something, esp words in reading
Fast readers will take in the sense of words even before fixation
esp in plant biology, the process of fixing something chemically
nitrogen fixation
the use of a chemical to stabilize a specimen, e.g. before examination under a microscope