Transition or transitional may refer to:

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 care, 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 rational unified process * A paradigm describing changes of communication mechanisms; see Transition (computer science)

Other uses in technology

* Terrafugia Transition, a flying car (or drivable airplane) * Transitions, a brand of photochromic lens, photochromic eyeglass lens and sponsor of the PGA Tour Transitions Championship * "Shifting gears" on a railroad locomotive; see Diesel locomotive#Propulsion system operation

Government and politics

* Brexit withdrawal agreement#Transition period * Democratic transition, change to a democratic regime * Peaceful transition of power a norm or practice in democratic governments, of transitions of power between different political parties * Social change, often synonymous with social transition * Transition management (governance) * United States presidential transition, the transfer of federal executive branch power from the incumbent President of the United States to the president-elect

Arts and entertainment

Literature

* Transition (fiction), a narrative element or general aspects of writing style that signal changes in a story * Transition (linguistics), a certain word, expression, or other device that gives text or speech greater cohesion by making it more explicit

Works

* Transition (literary journal), ''Transition'' (literary journal), an experimental literary journal that featured surrealist, expressionist, and Dada art and artists * Transition (novel), ''Transition'', a novel by Iain Banks * ''Transition'', a novel by Vonda N. McIntyre 1990 * ''Transition Magazine'', a political and literary journal published from 1961 to 1976 on the African continent, and revived in 1991 in the United States * Transitions (novel series), ''Transitions'' (novel series), a novel series by R A Salvatore * Transitions Online, Czech publisher of the ''Transitions'' news journal

Film, radio, and television

* Film transition, a method of juxtaposing two scenes, including: ** Wipe (transition), a type of film transition where one shot replaces another by travelling from one side of the frame to another or with a special shape ** Dissolve (filmmaking), a gradual transition from one image to another * Transition (The West Wing), "Transition" (''The West Wing''), season 7 episode 19 of US television series ''The West Wing'' * Transitions (film), ''Transitions'' (film), the world's first IMAX film in 3D, 1986 * Transition (1989 film), a film by the Iranian director Kamal Tabrizi * Transition (2023 film), ''Transition'' (2023 film), a documentary film * Transitions (radio show), a weekly two-hour radio show on Kiss 100 in the UK * Transitioning (Glee), "Transitioning" (''Glee''), an episode of US television series ''Glee'' * Transitions (Law & Order: Special Victims Unit episode), "Transitions" (''Law & Order: Special Victims Unit'' episode), season 10 episode 14 of US television series ''Law & Order: Special Victims Unit'' * Transitions (The Wire), "Transitions" (''The Wire''), an episode of US television series ''The Wire'' * "Transitions", an episode of US television series Without a Trace (season 3)#ep65, ''Without a Trace''

Music

* Transition (music), the middle passage of a piece of music * Transition (band), English indie rock band

Albums

* Transition (John Coltrane album), ''Transition'' (John Coltrane album), 1970 * Transition (The First Edition album), ''Transition'' (The First Edition album), 1971 * Transition (Buddy Rich Lionel Hampton album), ''Transition'' (Buddy Rich Lionel Hampton album), 1974 * Transition (John Miles album), ''Transition'' (John Miles album), 1985 * Transition (Fly to the Sky album), ''Transition'' (Fly to the Sky album), 2006 * Transition (Ryan Leslie album), ''Transition'' (Ryan Leslie album), 2009 * Transition (Chipmunk album), ''Transition'' (Chipmunk album), 2011 * Transition (Steve Lukather album), ''Transition'' (Steve Lukather album), 2013 * Transitions (John Digweed album), ''Transitions'' (John Digweed album), 2006 * Transitions (Aghora album), ''Transitions'' (Aghora album), 2006 * Transitions (Westbound Train album), ''Transitions'' (Westbound Train album), 2006 * Transitions (EP), ''Transitions'' (EP), 2010 by Canadian post-hardcore band Silverstein

Songs

* "Transition", by Pestilence from ''Obsideo'', 2013 * "Transition", by Theatre Of Tragedy from ''Forever Is the World'', 2009 * "The Transition", by Hawthorne Heights from ''The Silence in Black and White'', 2004 * "Transitions", by Beastie Boys from ''Ill Communication'', 1994 * "Transitions", by Zao from ''The Crimson Corridor'', 2021

Other arts

* Transitional Style, of furniture and interior design

Sport

* Transition (grappling), in grappling is a move from one grappling hold or grappling position to another * Transitions Championship, a men's professional golf tournament on the PGA Tour

Other uses

* Transition Glacier, a glacier on the east coast of Alexander Island * Transitional care, wherein a patient changes health care provider