noun

• The act of fixing.
• The state of being fixed or fixated.
• The act of uniting chemically with a solid substance or in a solid form; reduction to a non-volatile condition; -- said of volatile elements.
• The act or process of ceasing to be fluid and becoming firm.
• In metals, a state of resistance to evaporation or volatilization by heat.
• A state of mind involving obsession with a particular person, idea, or thing.
• A sexual fetish or turn-on; something one seeks in a romantic partner, often rejecting partners without the characteristic.
• (law) Recording a creative work in a medium of expression for more than a transitory duration, thereby satisfying the "fixation" requirement for the purposes of copyright law.
• (genetics) The change in a gene pool from a situation where there exists at least two variants of a particular gene (allele) to a situation where only one of the alleles remains.
• (cytology, histology, pathology) preservation of biological tissues from decay due to autolysis or putrefaction.
• (orthopaedics) process by which an injury is rendered immobile.
• (ophthalmology) maintaining of the gaze on a single location.