Editing Transition (section)

==Mathematics, science, and technology==
===Biology===
* [[Transition (genetics)]], a point mutation that changes a purine nucleotide to another purine (A ↔ G) or a pyrimidine nucleotide to another pyrimidine (C ↔ T)
* [[Transitional fossil]], any fossilized remains of a lifeform that exhibits the characteristics of two distinct taxonomic groups
* A phase during [[childbirth#First stage|childbirth contractions]] during which the cervix completes its dilation

===Gender and sex===
* [[Gender transition]], the process of changing one's gender presentation to accord with one's internal sense of one's gender – the idea of what it means to be a man or woman
* [[Gender-affirming therapy]], the physical aspect of a gender transition
** [[Gender-affirming surgery]], surgical intervention a part of medical gender affirmation

===Physics===
* [[Phase transition]], a transformation of the state of matter; for example, the change between a solid and a liquid, between liquid and gas or between gas and plasma
* [[Quantum phase transition]], a phase transformation between different quantum phases
* [[Quantum Hall transitions]], a quantum phase transition that occurred because of the quantum Hall effect
* [[Transition radiation]], contrasts to the [[Cherenkov radiation]]
* [[Atomic electron transition]], the transition of an electron from one quantum state to another within an atom
* [[Beta decay transition]], nuclear beta decay determined by changes in spin
* [[Laminar–turbulent transition]], the process of a laminar fluid flow becoming turbulent
* [[Glass transition]], the reversible transition in amorphous materials
* [[Lambda transition]], universality class in condensed matter physics

===Chemistry===
* [[Transition metal]], either an element whose atom has an incomplete d sub-shell, or any element in the d-block of the periodic table
* [[Transition state]], of a chemical reaction is a particular configuration along the reaction coordinate
* SRM transition, the precursor and product ion pair in [[Selected reaction monitoring]] (SRM) in analytical chemistry

===Computing===
* A movement between states of an abstract computer, described by a [[transition system]]
* A phase of the [[IBM Rational Unified Process#Transition Phase|project lifecycle in the Rational Unified Process]]
* A paradigm describing changes of communication mechanisms, see [[Transition (computer science)]]

===Other uses in technology===
* Transitions, a brand of [[Photochromic lens|photochromic eyeglass lens]] and sponsor of the PGA Tour Transitions Championship
* [[Transition (roadable aircraft)]], a flying car (or drivable airplane) made by Terrafugia
* "Shifting gears" on a railroad locomotive; see [[Diesel locomotive#Propulsion system operation]]